Wa·ter snake Zool. (a) A common North American colubrine snake (Tropidonotus sipedon) which lives chiefly in the water. (b) Any species of snakes of the family Homalopsidae, all of which are aquatic in their habits.
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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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