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, ∧ 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.