Wa·ter moc·ca·sin Zool. 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.
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Wa·ter ad·der Zool. (a) The water moccasin. (b) The common, harmless American water snake (Tropidonotus sipedon). See Illust. under Water Snake.
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