Heterotricha - Hibiscus

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Heterotricha (?), n. pl. [NL., fr. Gr. � other + �, gen. �, a hair.] (Zoöl.) A division of ciliated Infusoria, having fine cilia all over the body, and a circle of larger ones around the anterior end.

Heterotropal (?), Heterotropous (�), a. [Gr. eterotropos turning another way; � other + � to turn: cf. F. hétérotrope.] (Bot.) Having the embryo or ovule oblique or transverse to the funiculus; amphitropous. Gray.
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Hething (?), n. Contempt; scorn. [Obs.] Chaucer.
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Hetman (?), n.; pl. Hetmans (#). [Pol. hetman. Cf. .] A Cossack headman or general. The title of chief hetman is now held by the heir to the throne of Russia.
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Heuchera n. A genus of North American herbs with basal cordate or orbicular leaves and small panicled flowers.
Syn. -- genus Heuchera.
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Heugh (?), n. [Cf. .] 1. A crag; a cliff; a glen with overhanging sides. [Scot. & Prov. Eng.]
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2. A shaft in a coal pit; a hollow in a quarry. [Scot.]
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Heuk (?), n. Variant of . [Obs.]
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Heulandite (?), n. [After Heuland, an English mineralogist.] (Min.) A mineral of the Zeolite family, often occurring in amygdaloid, in foliated masses, and also in monoclinic crystals with pearly luster on the cleavage face. It is a hydrous silicate of alumina and lime.
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Heuristic (h�rĭstĭk), a. [Gr. eyriskein to discover.] 1. Serving to promote discovery or learning; -- used especially of thories or paradigms which stimulate new ideas for discovering facts in experimental sciences.
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2. Serving to stimulate people to learn and discover on their own, especially by encouraging experimental and trial-and-error methods for solving problems.
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3. Pertaining to or based on trial-and-error and experimental methods of learning and evaluation.
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4. (Computers) Based on the use of an efficient trial-and error method to search a space of possible solutions to a problem, or to find an acceptable approximate solution, when an exact algorithmic method is unavailable or too time-consuming.
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Heuristic (h�rĭstĭk), n. 1. A heuristic method; a specific heuristic procedure.
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2. A theory or approach which serves to promote discovery or learning by encouraging experimentation.
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heuristically (h�rĭstĭk�ll�), n. In a heuristic manner; by using a heuristic method; by serving as a heuristic method; as, a heuristically guided search technique; a heuristically valuable theory.
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Hevea prop. n. A small genus of South American trees yielding latex. It includes the rubber tree, Hevea brasiliensis, originally found in South America, but now used for production of rubber world-wide.
Syn. -- genus Hevea.
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Heved (?), n. The head. [Obs.] Chaucer.
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Hew (hū), v. t. [imp. Hewed (hūd); p. p. Hewed or Hewn (hūn); p. pr. & vb. n. Hewing.] [AS. heáwan; akin to D. houwen, OHG. houwan, G. hauen, Icel. höggva, Sw. hugga, Dan. hugge, Lith. kova battle, Russ. kovate to hammer, forge. Cf. cut grass, .] 1. To cut with an ax; to fell with a sharp instrument; -- often with down, or off. Shak.
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2. To form or shape with a sharp instrument; to cut; hence, to form laboriously; -- often with out; as, to hew out a sepulcher.
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Look unto the rock whence ye are hewn. Is. li. 1.
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Rather polishing old works than hewing out new. Pope.
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3. To cut in pieces; to chop; to hack.
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Hew them to pieces; hack their bones asunder. Shak.
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Hew, n. Destruction by cutting down. [Obs.]
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Of whom he makes such havoc and such hew. Spenser.
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Hew, n. 1. Hue; color. [Obs.] Chaucer.
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2. Shape; form. [Obs.] Spenser.
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Hewe (?), n. [Cf. a peasant.] A domestic servant; a retainer. [Obs.] “False homely hewe.” Chaucer.
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Hewer (?), n. One who hews.
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Hewhole (?), n. [Cf. .] (Zoöl.) The European green woodpecker. See .
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Hewn (?), a. 1. Felled, cut, or shaped as with an ax; roughly squared; as, a house built of hewn logs.
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2. Roughly dressed as with a hammer; as, hewn stone.

Hex- (?), Hexa (#). [Gr. ex six. See .] A prefix or combining form, used to denote six, sixth, etc.; as, hexatomic, hexabasic.
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Hexabasic (?), a. [Hexa- + basic.] (Chem.) Having six hydrogen atoms or six radicals capable of being replaced or saturated by bases; -- said of acids; as, mellitic acid is hexabasic.
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Hexacapsular (?), a. [Hexa- + capsular.] (Bot.) Having six capsules or seed vessels.
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Hexachord (?), n. [Hexa- + Gr. � string, chord: cf. F. hexacorde.] (Mus.) A series of six notes, with a semitone between the third and fourth, the other intervals being whole tones.
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Hexacid (?), a. [Hex- + acid.] (Chem.) Having six atoms or radicals capable of being replaced by acids; hexatomic; hexavalent; -- said of bases; as, mannite is a hexacid base.
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Hexactinellid (?), a. (Zoöl.) Having six-rayed spicules; belonging to the Hexactinellinæ.
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Hexactinelline (?), a. [From NL. Hexactinellinæ, fr. Gr. ex six + a dim. of �, �, a ray.] (Zoöl.) Belonging to the Hexactinellinæ, a group of sponges, having six-rayed siliceous spicules.
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Hexactinia (?), n. pl. [NL. See , and .] (Zoöl.) The Anthozoa.
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Hexad (?), n. [L. hexas, hexadis, the number six, Gr. �, �, fr. ex six.] (chem.) An atom whose valence is six, and which can be theoretically combined with, substituted for, or replaced by, six monad atoms or radicals; as, sulphur is a hexad in sulphuric acid. Also used as an adjective.
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Hexadactylous (?), a. [Gr. �; ex six + � finger: cf. F. hexadactyle.] (Zoöl.) Having six fingers or toes.
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Hexade (?), n. [See .] A series of six numbers.
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Hexadecane (?), n. (Chem.) See .
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Hexagon (?), n. [L. hexagonum, Gr. � six-cornered; ex six (akin to E. six) + � angle.] (Geom.) A plane figure of six angles.
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Coloq. Regular hexagon , a hexagon in which the angles are all equal, and the sides are also all equal.
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Hexagonal (?), a. [Cf. F. hexagonal.] Having six sides and six angles; six-sided.
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Coloq. Hexagonal system . (Crystal.) See under .
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Hexagonally, adv. In an hexagonal manner.
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Hexagony (?), n. A hexagon. [Obs.] Bramhall.
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Hexagram (?), n. [Hexa- + -gram.] A figure of six lines; specif.: (a) A figure composed of two equal triangles intersecting so that each side of one triangle is parallel to a side of the other, and the six points coincide with those of a hexagon. (b) In Chinese literature, one of the sixty-four figures formed of six parallel lines (continuous or broken), forming the basis of the I Ching (Yih King), or “Book of Changes.” S. W. Williams.
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Hexagynia (?), n. pl. [NL., fr. Gr. ex six + gynh^ a woman, female: cf. F. hexagynie.] (Bot.) A Linnæan order of plants having six pistils.

Hexagynian (?), Hexagynous (�), a. [Cf. F. hexagyne.] (Bot.) Having six pistils.
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Hexahedral (?), a. In the form of a hexahedron; having six sides or faces.
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Hexahedron (?), n.; pl. E. Hexahedrons (#), L. Hexahedra (#). [Hexa- + Gr. � seat, base, fr. � to sit: cf. F. hexaèdre.] (Geom.) A solid body of six sides or faces.
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Coloq. Regular hexahedron , a hexagon having six equal squares for its sides; a cube.
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Hexahemeron (?), n. [NL., fr. Gr. ex six + � day; cf. L. hexaëmeron, Gr. �.]
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1. A term of six days. Good.
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2. The history of the six day's work of creation, as contained in the first chapter of Genesis.
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Hexamerous (?), a. [Hexa- + Gr.� part.] (Bot.) In six parts; in sixes.
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Hexameter (?), n. [L., fr. Gr. � of six meters; (sc. �) hexameter verse; ex six + � measure: cf. F. hexamètre. See , and .] (Gr. & Lat. Pros.) A verse of six feet, the first four of which may be either dactyls or spondees, the fifth must regularly be a dactyl, and the sixth always a spondee. In this species of verse are composed the Iliad of Homer and the Æneid of Virgil. In English hexameters accent takes the place of quantity.
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Hexameter, a. Having six metrical feet, especially dactyls and spondees. Holland.

{ Hexametric (?), Hexametrical (?), } a. Consisting of six metrical feet.
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Hexametrist (?), n. One who writes in hexameters. “The Christian hexametrists.” Milman.
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Hexandria (?), n. pl. [NL., fr. Gr. ex six + �, �, a man, male: cf. F. hexandrie.] (Bot.) A Linnæan class of plants having six stamens.

{ Hexandrian (?), Hex-androus (?), } a. [Cf. F. hexandre.] (Bot.) Having six stamens.
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Hexane (?), n. [Gr. ex six.] (Chem.) Any one of five hydrocarbons, C6H14, of the paraffin series. They are colorless, volatile liquids, and are so called because the molecule has six carbon atoms.
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Hexangular (?), a. [Hex- + angular. Cf. .] Having six angles or corners.
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Hexapetalous (?), a. [Hexa- + petal: cf. F. hexapétale.] (Bot.) Having six petals.
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Hexaphyllous (?), a. [Hexa- + Gr. � a leaf: cf. F. hexaphylle.] (Bot.) Having six leaves or leaflets.
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Hexapla (?), n. Etym. pl., but syntactically sing. [NL., fr. Gr. �, fr. �, contr. �, sixfold.] A collection of the Holy Scriptures in six languages or six versions in parallel columns; particularly, the edition of the Old Testament published by Origen, in the 3d century.
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Hexapod (?), a. [Gr. �, �, sixfooted; ex six + �, �, foot: cf. F. hexapode.] Having six feet. -- n. (Zoöl.) An animal having six feet; one of the Hexapoda.
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Hexapoda (?), n. pl. [NL., fr. Gr. ex six + -poda.] (Zoöl.) The true, or six-legged, insects; insects other than myriapods and arachnids.
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☞ The Hexapoda have the head, thorax, and abdomen differentiated, and are mostly winged. They have three pairs of mouth organs, viz., mandibles, maxillæ, and the second maxillæ or labial palpi; three pairs of thoracic legs; and abdominal legs, which are present only in some of the lowest forms, and in the larval state of some of the higher ones. Many (the Metabola) undergo a complete metamorphosis, having larvæ (known as maggots, grubs, caterpillars) very unlike the adult, and pass through a quiescent pupa state in which no food is taken; others (the Hemimetabola) have larvæ much like the adult, expert in lacking wings, and an active pupa, in which rudimentary wings appear. See . The Hexapoda are divided into several orders.
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Hexapodous (?), a. (Zoöl.) Having six feet; belonging to the Hexapoda.
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Hexapterous (?), a. [Hexa- + Gr. � wing.] (Bot.) Having six processes. Gray.

{ Hexastich (?), Hexastichon (?), } n. [L. hexastichus of six rows, lines, or verses, Gr. �; ex six + stichos row, line, verse.] A poem consisting of six verses or lines.
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Hexastyle (?), a. [Gr. � with six columns; ex six + column: cf. F. hexastyle.] (Arch.) Having six columns in front; -- said of a portico or temple. -- n. A hexastyle portico or temple.
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Hexateuch (?), n. [Hexa- + � a tool, a book.] The first six books of the Old Testament.
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Hexatomic (?), a. [Hex- + atomic.] (Chem.) (a) Having six atoms in the molecule. [R.] (b) Having six replaceable radicals.
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Hexavalent (?), a. [Hexa- + L. valens, -entis, p. pr. See .] (Chem.) Having a valence of six; -- said of hexads.
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Hexdecyl (?), n. [Hex- + decyl.] (Chem.) The essential radical, C16H33, of hecdecane.
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Hexdecylic (?), a. (Chem.) Pertaining to, or derived from, hexdecyl or hecdecane; as, hexdecylic alcohol.
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Hexeikosane (?), n. [Hex- + eikosane.] (chem.) A hydrocarbon, C26H54, resembling paraffine; -- so called because each molecule has twenty-six atoms of carbon. [Written also hexacosane.]
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Hexene (?), n. [Gr. ex six.] (Chem.) Same as .
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Hexicology (?), n. [Gr. � state or habit + -logy.] The science which treats of the complex relations of living creatures to other organisms, and to their surrounding conditions generally. St. George Mivart.
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Hexine (?), n. [Gr. ex six.] (Chem.) A hydrocarbon, C6H10, of the acetylene series, obtained artificially as a colorless, volatile, pungent liquid; -- called also hexoylene.
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Hexoctahedron (?), n. [Hex- + octahedron.] (Geom.) A solid having forty-eight equal triangular faces.
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Hexoic (?), a. (Chem.) Pertaining to, or derived from, hexane; as, hexoic acid.
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Hexokinase (?), n. [Hexose + -kinase.] (Biochem.) an enzyme catalyzing the transfer of a phosphate residue from ATP to a hexose, as in the formation of glucose-6-phosphate from glucose.
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Hexone (?), n. [Hex- + -one.] (Chem.) A liquid hydrocarbon, C6H8, of the valylene series, obtained from distillation products of certain fats and gums.
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Hexose (?), n. [Hexa- + -ose.] (Chem.) Any member of a group of sugars containing six carbon atoms in the molecule. Some are widely distributed in nature, esp. in ripe fruits.
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Hexyl (?), n. [Hex- + -yl.] (chem.) A univalent organic radical, C6H13-, regarded as the essential residue of hexane, and a related series of compounds.
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Hexylene (?), n. [Hex- + -yl + ethlene.] (Chem.) A colorless, liquid hydrocarbon, C6H12, of the ethylene series, produced artificially, and found as a natural product of distillation of certain coals; also, any one several isomers of hexylene proper. Called also hexene.
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Hexylic (?), a. (chem.) Pertaining to, or derived from, hexyl or hexane; as, hexylic alcohol.
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Hey (?), a. [See .] High. [Obs.] Chaucer.
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Hey (?), interj. [OE. hei; cf. D. & G. hei.] 1. An exclamation of joy, surprise, or encouragement. Shak.
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2. A cry to set dogs on. Shak.
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Heyday (?), interj. [Cf. G. heida, or hei da, D. hei daar. Cf. , and .] An expression of frolic and exultation, and sometimes of wonder. B. Jonson.
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Heyday (?), n. [Prob. for. high day. See High, and .] The time of triumph and exultation; hence, joy, high spirits, frolicsomeness; wildness.
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The heyday in the blood is tame. Shak.
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In the heyday of their victories. J. H. Newman.
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Heydeguy (?), n. [Perh. fr. heyday + guise.] A kind of country-dance or round. [Obs.] Spenser.

Heyh, Heygh (�), a. High. [Obs.] Chaucer.
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Heyne (?), n. [AS. heán low, mean.] A wretch; a rascal. [Obs.] Chaucer.
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Heyten (?), adv. [Icel. h��an.] Hence. [Obs.] Chaucer.
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Hiation (?), n. [See .] Act of gaping. [Obs.] Sir T. Browne.
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Hiatus (?), n.; pl. L. Hiatus, E. Hiatuses (#). [L., fr. hiare, hiatum, to gape; akin to E. yawn. See .] 1. An opening; an aperture; a gap; a chasm; esp., a defect in a manuscript, where some part is lost or effaced; a space where something is wanting; a break.
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2. (Gram.) The concurrence of two vowels in two successive words or syllables. Pope.
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Hibbertia n. A genus of evergreen heathlike or scandent shrubs of Madagascar, Australasia, and Polynesia.
Syn. -- genus Hibbertia.
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Hibernacle (?), n. [L. hibernaculum a winter residence, pl. hibernacula winter quarters: cf. F. hibernacle. See .] That which serves for protection or shelter in winter; winter quarters; as, the hibernacle of an animal or a plant. Martyn.
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Hibernaculum (?), n. [See .] 1. (Bot.) A winter bud, in which the rudimentary foliage or flower, as of most trees and shrubs in the temperate zone, is protected by closely overlapping scales.
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2. (Zoöl.) A little case in which certain insects pass the winter.
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3. Winter home or abiding place. J. Burroughs.
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Hibernal (?), a. [L. hibernalis, from the root of hiems winter; akin to Gr. � snow, Skr. hima cold, winter, snow: cf. F. hibernal.] Belonging or relating to winter; wintry; winterish. Sir T. Browne.
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Hibernate (?), v. i. [imp. & p. p. Hibernated (?); p. pr. & vb. n. Hibernating (?).] [L. hibernare, hibernatum, fr. hibernus wintry. See .] To winter; to pass the season of winter in close quarters, in a torpid or lethargic state, as certain mammals, reptiles, and insects.
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Inclination would lead me to hibernate, during half the year, in this uncomfortable climate of Great Britain. Southey.
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hibernating adj. in a state of suspended animation; -- of animals that sleep most of the winter. [prenominal]
Syn. -- dormant, torpid.
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Hibernation (?), n. [Cf. F. hibernation.] The act or state of hibernating. Evelyn.
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Hibernian (?), a. [L. Hibernia, Ireland.] Of or pertaining to Hibernia, now Ireland; Irish. -- n. A native or an inhabitant of Ireland.

{ Hibernicism (?), Hibernianism (?), } n. An idiom or mode of speech peculiar to the Irish. Todd.
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Hiberno-Celtic (?), n. The native language of the Irish; that branch of the Celtic languages spoken by the natives of Ireland. Also adj.
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Hibiscus (?), n. [L., marsh mallow; cf. Gr. �.] (Bot.) A genus of plants (herbs, shrubs, or trees), some species of which have large, showy flowers. Some species are cultivated in India for their fiber, which is used as a substitute for hemp. See , , and .
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Hiccius doctius (?). [Corrupted fr. L. hic est doctus this is a learned man.] A juggler. [Cant] Hudibras.
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