Definitions for "cottonmouth"
venomous semiaquatic snake (Agkistrodon piscivorus) of swamps in southern U.S.; -- called also water moccasin, cottonmouth moccasin, and cottonmouth water moccasin. It grows to a length of about 4 feet. The name refers to the whiteness of the lips and inside of the mouth.
Water Moccasin. A pit viper, called cottonmouth because of its white mouth in contrast to it's very dark, black body. Lives near water east of the Rockies. It swims and is more aggressive than most snakes
a meaner-than-Aunt-Louise poisonous snake that lives in rivers and ponds.