from
The Collaborative International Dictionary of English v.0.48
Hydrocyanic \Hy`dro*cy*an"ic\, a. [Hydro-, 2 + anic: cf. F.
hydrocyanique.] (Chem.)
Pertaining to, or derived from the combination of, hydrogen
and cyanogen.
[1913 Webster]
{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.
[1913 Webster]