Thomas Davidson

“ Hydrocephalus, hī-dro-sef′a-lus, n. an accumulation of serous fluid within the cranial cavity, either in the sub-dural space or the ventricles: water in the head: dropsy of the brain.—adjs. Hydrocephal′ic, Hydroceph′aloid, Hydroceph′alous. [Gr. hydōr, water, kephalē, the head.]
Hydrochloric, hī-dro-klō′rik, adj. compounded of hydrogen and chlorine.—n. ”

“ Hygroscope, hī′gro-skōp, n. an instrument for indicating the humidity of the atmosphere.—adjs. Hygroscop′ic, -al.—ns. Hygroscopic′ity; Hygrostat′ics, the art of measuring degrees of moisture. [Gr. hygros, wet, skopein, to view.]
Hyksos, hik′sos, n. the shepherd kings, apparently a Tartar race who overthrew the reigning dynasty of Lower Egypt about 2000 B.C., and reigned until overturned by the Egyptian rulers of Upper Egypt about 1700 B.C.
Hyleg, hī′leg, n. the planet which rules at the hour of one's birth, in that sign of the zodiac immediately above the eastern horizon. ”

“ Hy′dro-extract′or, an apparatus for removing moisture from yarns, cloths, &c., in process of manufacture. [Gr. hydōr, water, and dynamics.]
Hydrofluoric, hī-dro-flōō-or′ik, adj. consisting of fluorine and hydrogen.
Hydrogen, hī′dro-jen, n. a gas which in combination with oxygen produces water, an elementary gaseous substance, the lightest of all known substances, and very inflammable.—adjs. Hy′dric, containing hydrogen; Hydrog′enous, containing hydrogen: produced by the action of water, as applied to rocks in opposition to those that are pyrogenous, formed by the action of fire. ”

“ Hypnotism, hip′no-tizm, n. a sleep-like condition induced by artificial means: a nervous sleep like the condition under mesmerism.—n. Hypnogen′esis, production of hypnotism—also Hypnog′eny.—adj. Hypnogenet′ic.—adv. Hypnogenet′ically.—adjs. Hypnogen′ic, Hypnot′ic, having the property of producing sleep; Hypnog′enous.—ns. Hypnol′ogy, the sum of knowledge about sleep; Hypnō′sis, the production of sleep: the hypnotic state; Hypnot′ic, a medicine that induces sleep; Hypnotisabil′ity.—adj. ”

“ Hygiol′ogy, art of the preservation of health. [Gr. hygieia—hygiēs, healthy.]
Hygrodeik, hī′gro-dīk, n. a form of hygrometer in which the atmospheric humidity is indicated by an index controlled by the heights of a wet-bulb and a dry-bulb thermometer, supported on each side of a frame on which is described a scale. [Gr. hygros, wet, deik-nynai, to show.]
Hygrometer, hī-grom′et-ėr, n. an instrument for measuring the moisture in the atmosphere, or its relative humidity.—n. Hygrom′etry, the art of measuring the moisture in the atmosphere, and of bodies generally.—adjs. Hygromet′ric, -al. ”

“ Hyades, hī′a-dēz, Hyads, hī′adz, n. a cluster of five stars in the constellation of the Bull, supposed by the ancients to bring rain when they rose with the sun. [Gr. hyades, explained by the ancients as from hyein, to rain; more prob.=little pigs, hys, a pig.] ”

“ Hydraul′ics, used as sing., the science of hydrodynamics in its practical application to water-pipes, &c.—Hydraulic belt, an arrangement for lifting water, consisting of an endless belt fitted with buckets which discharge as they turn over an upper wheel; Hydraulic cement, lime, a cement that sets or hardens under water; Hydraulic jack, a jack or lifting apparatus, by means of oil, &c., pressed by a force-pump against a piston or plunger ”

“ Hyponasty, hī′po-nas-ti, n. (bot.) increased growth along the lower surface of an organ or part of a plant, causing the part to bend upward:—opp. to Epinasty.
Hypophosphite, hī-po-fos′fīt, n. (chem.) a salt obtained by the union of hypophosphorous acid with a salifiable base—also Hypophos′phate.—adjs. Hypophosphor′ic, Hypophos′phorous, containing less oxygen than phosphorous acid contains. ”

“ Hypericum, hī-per′i-kum, n. a large genus of plants, of which St John's wort is a typical species. [Gr. hypo, under, ereikē, heath.]
Hyperinosis, hī-per-i-nō′sis, n. excess of fibrin in the blood:—opp. to Hypinosis.—adj. Hyperinot′ic.
Hyperion, hī-pēr′i-on, n. a Titan, son of Uranus and Ge, and father of Helios, Selene, and Eos: Helios himself, the incarnation of light and beauty. ”

“ Hyp′notoid, like hypnotism. [Coined in 1843 from Gr. hypnos, sleep.]
Hypnum, hip′num, n. the largest genus of mosses, order Bryineæ, having archegonia and capsules borne on special lateral branches.
Hypobole, hip-pob′o-lē, n. (rhet.) the mention in argument of things apparently damaging to one's side, with the successive refutation of each. [Gr.]
Hypocaust, hip′o-kawst, n. among the ancients, a vaulted chamber from which the heat of stoves was distributed to baths or rooms above: now applied to the fireplace of a stove or hothouse. [Gr. hypokauston—hypo, under, kaiein, to burn.] ”