or cottonmouth Either of two species of pit viper that inhabits marshy lowlands of the southeastern U.S. and Mexico. The U.S. species (Agkistrodon piscivorus) is called a cottonmouth because it threatens with the mouth open, showing the white interior. It is up to 5 ft (1.5 m) long and is completely black or brown with darker crossbands. A dangerous snake with a potentially lethal bite, it tends to stand its ground or move slowly away when alarmed. It will eat almost any small animal, including turtles, fishes, and birds. See also copperhead
any of numerous North American water snakes inhabiting fresh waters venomous semiaquatic snake of swamps in southern United States
A venomous North American snake (Ancistrodon piscivorus) allied to the rattlesnake but destitute of a rattle
{i} type of poisonous semiaquatic snake that lives in swamps and is found in southern United States, cottonmouth, moccasin; snake that looks like a poisonous water moccasin but is harmless