Source : Webster's Revised Unabridged Dictionary (1913)

Cyanide \Cy"a*nide\ (s?"?-n?d or -n?d; 104), n. [Cf. F. cyanide.
   See {Cyanic}.] (Chem.)
   A compound formed by the union of cyanogen with an element or
   radical.

Source : WordNet®

cyanide
     n 1: any of a class of organic compounds containing the cyano
          radical -CN [syn: {nitrile}, {nitril}]
     2: an extremely poisonous salt of hydrocyanic acid