Source : Webster's Revised Unabridged Dictionary (1913)

Fer-de-lance \Fer`-de-lance"\, n. [F., the iron of a lance,
   lance head.] (Zo["o]l.)
   A large, venomous serpent ({Trigonocephalus lanceolatus}

Source : WordNet®

fer-de-lance
     n : large extremely venomous pit viper of Central America and
         South America [syn: {Bothrops atrops}]