Chapter Hydrated to Hydroidea of H by Webster's Dictionary (1913 Edition)

Hydrocarbon
(Hy`dro*car"bon) n. [Hydro-, 2 + carbon.] (Chem.) A compound containing only hydrogen and carbon, as methane, benzene, etc.; also, by extension, any of their derivatives.

Hydrocarbon burner, furnace, stove, a burner, furnace, or stove with which liquid fuel, as petroleum, is used.

Hydrocarbonaceous
(Hy`dro*car`bo*na"ceous) a. Of the nature, or containing, hydrocarbons.

Hydrocarbonate
(Hy`dro*car"bon*ate) n. (a) (Old Chem.) A hydrocarbon. [Obs.] (b) (Chem.) A hydrous carbonate, as malachite.

Hydrocarbostyril
(Hy`dro*car`bo*sty"ril) n. [Hydro-, 2 + carbostyril.] (Chem.) A white, crystalline, nitrogenous hydrocarbon, C₉H₉NO, obtained from certain derivatives of cinnamic acid and closely related to quinoline and carbostyril.

Hydrocarburet
(Hy`dro*car"bu*ret) n. [Hydro- , 2 + carburet.] (Chem.) Carbureted hydrogen; also, a hydrocarbon. [Obs.]

Hydrocaulus
(Hy`dro*cau"lus) n.; pl. Hydrocauli [NL., fr. Gr. "y`dwr water + a stalk.] (Zoöl.) The hollow stem of a hydroid, either simple or branched. See Illust. of Gymnoblastea and Hydroidea.

Hydrocele
(Hy`dro*cele) n. [L., fr. Gr. "y`dwr water + tumor.] (Med.) A collection of serous fluid in the areolar texture of the scrotum or in the coverings, especially in the serous sac, investing the testicle or the spermatic cord; dropsy of the testicle.

Hydrocephalic
(Hy`dro*ce*phal"ic) a. Relating to, or connected with, hydrocephalus, or dropsy of the brain.

Hydrocephaloid
(Hy`dro*ceph"a*loid) a. [Hydrocephalus + -oid.] (Med.) Resembling hydrocephalus.

Hydrocephaloid affection (Med.), the group of symptoms which follow exhausting diarrhea in young children, resembling those of acute hydrocephalus, or tubercular meningitis.

Hydrocephalous
(Hy`dro*ceph"a*lous) a. Having hydrocephalus. "Hydrocephalous offspring." G. Eliot.

Hydrocephalus
(Hy`dro*ceph"a*lus) n. [NL., fr. Gr. hydrocephalus; "y`dwr water + head.] (Med.) An accumulation of liquid within the cavity of the cranium, especially within the ventricles of the brain; dropsy of the brain. It is due usually to tubercular meningitis. When it occurs in infancy, it often enlarges the head enormously.

Hydrochlorate
(Hy`dro*chlo"rate) n. (Chem.) Same as Hydrochloride.

Hydrochloric
(Hy`dro*chlo"ric) a. [Hydro-, 2 + chloric: cf. F. hydrochlorique.] (Chem.) Pertaining to, or compounded of, chlorine and hydrogen gas; as, hydrochloric acid; chlorhydric.

Hydrochloric acid (Chem.), hydrogen chloride; a colorless, corrosive gas, HCl, of pungent, suffocating odor. It is made in great quantities in the soda process, by the action of sulphuric acid on common salt. It has a great affinity for water, and the commercial article is a strong solution of the gas in water. It is a typical acid, and is an indispensable agent in commercial and general chemical work. Called also muriatic, &and chlorhydric, acid.

Hydrochloride
(Hy`dro*chlo"ride) n. (Chem.) A compound of hydrochloric acid with a base; — distinguished from a chloride, where only chlorine unites with the base.