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fer de lance
n. a large highly venomous snake, Bothrops atrox, native to Central and S. America.
Etymology: F, = iron (head) of a lance

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[ˌfer dl'ans; -'äns]
n. (pl. fers de lance pronunc. same or [ˌferz-]; or fer de lances) a large and dangerous pit viper native to Central and South America. Genus Bothrops, family Viperidae: several species, in particular B. atrox
Origin:
late 19th cent.: from French, literally ‘iron (head) of a lance’

Useful english dictionary. 2012.