Webster's 1828 Dictionary
HYDROCYANIC
a.[Gr. water, or rather hydrogen, and blue. ] The hydrocyanic acid is the same as the prussic acid.
Webster's 1913 Dictionary
HYDROCYANIC
Hy `dro *cy *an "ic, a. Etym: [Hydro-, 2 + anic: cf. F. hydrocyanique.](Chem. )
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.
New American Oxford Dictionary
hydrocyanic acid
hy dro cy an ic ac id |ˌhīdrōsīˈanik ˌhaɪdroʊˌsaɪˌænɪk ˈæsəd | ▶noun Chemistry a highly poisonous acidic solution of hydrogen cyanide in water.
Oxford Dictionary
hydrocyanic acid
hydrocyanic acid |ˌhʌɪdrə (ʊ )sʌɪˈanɪk | ▶noun [ mass noun ] Chemistry a highly poisonous acidic solution of hydrogen cyanide in water.
The Wordsmith Dictionary