The Collaborative International Dictionary
water viper
Water moccasin \Wa"ter moc"ca*sin\ (Zo["o]l.) A venomous North American snake ( Ancistrodon piscivorus) allied to the rattlesnake but destitute of a rattle. It lives in or about pools and ponds, and feeds largely of fishes. Called also water snake, water adder, water viper.