*viperine*

a. [ L. viperinus: cf. F. vipérin. ] Of or pertaining to a viper or vipers; resembling a viper. [ 1913 Webster ]

Viperine snake. (Zool.) (a) Any venomous snake of the family Viperidae. (b) A harmless snake resembling a viper in form or color, esp. Tropidonotus viperinus, a small European species which resembles the viper in color. [ 1913 Webster ]