viperine : Idioms & Phrases
viperine grass snake
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noun a small harmless grass snake
Natrix maura.
WordNet
Viperine snake
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(Zoöl.) (a) Any venomous snake of the familyViperidæ .(b) A harmless snake resembling a viper in form or color, esp.Tropidonotus viperinus , a small European species which resembles the viper in color.