Defn: Pertaining to, or derived from the combination of, hydrogen and cyanogen. Hydrocyanic acid (Chem.), a colorless, mobile, volatile liquid, HCN, having a characteristic peach-blossom odor. It is one of the most deadly poisons. It is made by the action of sulphuric acid on yellow prussiate of potassium (potassium ferrocyanide), and chemically resembles hydrochloric and hydrobromic acids. Called also prussic acid, hydrogen cyanide, etc.
HYDROCYANIDE
Hy`dro*cy"a*nide, n. (Chem.)
Defn: A compound of hydrocyanic acid with a base; — distinguished from a cyanide, in which only the cyanogen so combines.
HYDRODYNAMIC; HYDRODYNAMICAL Hy`dro*dy*nam"ic, Hy`dro*dy*nam"ic*al, a. Etym: [Hydro-, 1 + dynamic, -ical: cf. F. hydrodynamique.]
Defn: Pertaining to, or derived from, the dynamical action of water of a liquid; of or pertaining to water power. Hydrodynamic friction, friction produced by the viscosity of a liquid in motion.
HYDRODYNAMICS Hy`dro*dy*nam"ics, n. Etym: [Hydro-, 1 + dynamics: cf. F. hydrodynamique.]
Defn: That branch of the science of mechanics which relates to fluids, or, as usually limited, which treats of the laws of motion and action of nonelastic fluids, whether as investigated mathematically, or by observation and experiment; the principles of dynamics, as applied to water and other fluids.
Note: The word is sometimes used as a general term, including both hydrostatics and hydraulics, together with pneumatics and acoustics. See Hydraulics.
HYDRODYNAMOMETER
Hy`dro*dy`na*mom"e*ter, n. Etym: [Hydro-, 1 + dynamometer.]
Defn: An instrument to measure the velocity of a liquid current by the force of its impact.