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Heulandite

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.

Heuristic

A heuristic method; a specific heuristic procedure.

heuristically

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.

Hevea

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.

Hewe

A domestic servant; a retainer.

Hewhole

The European green woodpecker. See Yaffle.

Hewn

Felled, cut, or shaped as with an ax; roughly squared; as, a house built of hewn logs.

Hexabasic

Having six hydrogen atoms or six radicals capable of being replaced or saturated by bases; -- said of acids; as, mellitic acid is hexabasic.

Hexachord

A series of six notes, with a semitone between the third and fourth, the other intervals being whole tones.

Hexacid

Having six atoms or radicals capable of being replaced by acids; hexatomic; hexavalent; -- said of bases; as, mannite is a hexacid base.

Hexactinellid

Having six-rayed spicules; belonging to the Hexactinellin/.

Hexactinelline

Belonging to the Hexactinellin/, a group of sponges, having six-rayed siliceous spicules.

Hexad

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.

Hexade

A series of six numbers.

Hexagon

A plane figure of six angles.

Hexagonal

Having six sides and six angles; six-sided.

Hexagram

A figure of six lines 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. 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./

Hexagynia

A Linn/an order of plants having six pistils.

Hexahedral

In the form of a hexahedron; having six sides or faces.

Hexameter

Having six metrical feet, especially dactyls and spondees.

Hexandria

A Linn/an class of plants having six stamens.

Hexane

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.

Hexapla

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.

Hexapod

Having six feet. An animal having six feet; one of the Hexapoda.

Hexapoda

The true, or six-legged, insects; insects other than myriapods and arachnids.

Hexapodous

Having six feet; belonging to the Hexapoda.

Hexastyle

Having six columns in front; -- said of a portico or temple. A hexastyle portico or temple.

Hexateuch

The first six books of the Old Testament.

Hexatomic

Having six atoms in the molecule. Having six replaceable radicals.

Hexavalent

Having a valence of six; -- said of hexads.

Hexdecyl

The essential radical, C16H33, of hecdecane.

Hexdecylic

Pertaining to, or derived from, hexdecyl or hecdecane; as, hexdecylic alcohol.

Hexeikosane

A hydrocarbon, C26H54, resembling paraffine; -- so called because each molecule has twenty-six atoms of carbon.

Hexicology

The science which treats of the complex relations of living creatures to other organisms, and to their surrounding conditions generally.

Hexine

A hydrocarbon, C6H10, of the acetylene series, obtained artificially as a colorless, volatile, pungent liquid; -- called also hexoylene.

Hexoic

Pertaining to, or derived from, hexane; as, hexoic acid.

Hexokinase

an enzyme catalyzing the transfer of a phosphate residue from ATP to a hexose, as in the formation of glucose-6-phosphate from glucose.

Hexone

A liquid hydrocarbon, C6H8, of the valylene series, obtained from distillation products of certain fats and gums.

Hexose

Any member of a group of sugars containing six carbon atoms in the molecule. Some are widely distributed in nature, esp. in ripe fruits.

Hexyl

A univalent organic radical, C6H13-, regarded as the essential residue of hexane, and a related series of compounds.

Hexylene

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.

Hexylic

Pertaining to, or derived from, hexyl or hexane; as, hexylic alcohol.

Hey

An exclamation of joy, surprise, or encouragement.

Heyday

The time of triumph and exultation; hence, joy, high spirits, frolicsomeness; wildness.

Heydeguy

A kind of country-dance or round.

hi-fi hifi

An electronic device that plays phonograph records, reproducing the original sound with a high degree of fidelity. It superseded the older phonographs, and itself is being displaced in popularity by CD players.

Hiatus

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.

Hibbertia

A genus of evergreen heathlike or scandent shrubs of Madagascar, Australasia, and Polynesia.

Hibernacle

That which serves for protection or shelter in winter; winter quarters; as, the hibernacle of an animal or a plant.

Hibernaculum

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.

Hibernal

Belonging or relating to winter; wintry; winterish.

Hibernate

To winter; to pass the season of winter in close quarters, in a torpid or lethargic state, as certain mammals, reptiles, and insects.

hibernating

in a state of suspended animation; -- of animals that sleep most of the winter.

Hibernian

Of or pertaining to Hibernia, now Ireland; Irish. A native or an inhabitant of Ireland.

Hiberno-Celtic

The native language of the Irish; that branch of the Celtic languages spoken by the natives of Ireland. Also adj.

Hibiscus

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 Althea, Hollyhock, and Manoe.

Hiccough

To have a hiccough or hiccoughs.

hick

rural. Opposite of urban.

hickie hickey

A device used to adapt a lighting fixture for mounting in an outlet box, or on a pipe.

Hickory

An American tree of the genus Carya, of which there are several species. The shagbark is the Carya alba, and has a very rough bark; it affords the hickory nut of the markets. The pignut, or brown hickory, is the Carya glabra. The swamp hickory is Carya amara, having a nut whose shell is very thin and the kernel bitter.

Hicksite

A member or follower of the /liberal/ party, headed by Elias Hicks, which, because of a change of views respecting the divinity of Christ and the Atonement, seceded from the conservative portion of the Society of Friends in the United States, in 1827.

Hid

imp. p. p. of Hide. See Hidden.

Hidage

A tax formerly paid to the kings of England for every hide of land.

Hidalgo

A title, denoting a Spanish nobleman of the lower class.

Hidden

from Hide. Concealed; put out of view; secret; not known; mysterious.

Hiddenite

An emerald-green variety of spodumene found in North Carolina; lithia emerald, -- used as a gem.

Hide

To flog; to whip.

hide and go seek hide-and-seek

A game played by children, in which one child (who is /it/) covers his eyes for a short time while the other players hide, and then the one who is /it/ tries to find the others.

hideaway

a hiding place; usually a remote place used by outlaws.

Hidebound

Having the skin adhering so closely to the ribs and back as not to be easily loosened or raised; -- said of an animal.

Hideous

Frightful, shocking, or offensive to the eyes; dreadful to behold; as, a hideous monster; hideous looks.

hideout

a hiding place; usually a remote place used by outlaws.

Hider

One who hides or conceals.

Hidrosis

Excretion of sweat; perspiration.

Hidrotic

A medicine that causes perspiration; a diaphoretic or a sudorific.

Hie

Haste; diligence.

Hierapicra

A warming cathartic medicine, made of aloes and canella bark.

Hierarch

One who has high and controlling authority in sacred things; the chief of a sacred order; as, princely hierarchs.

Hierarchy

Dominion or authority in sacred things.

Hieratic

Consecrated to sacred uses; sacerdotal; pertaining to priests.

Hierocracy

Government by ecclesiastics; a hierarchy.

Hierogram

A form of sacred or hieratic writing.

Hierogrammatic

Written in, or pertaining to, hierograms; expressive of sacred writing.

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