: a snake (as of the genus Natrix) resembling a water moccasin
Either of two species of pit viper: the water moccasin or the Mexican moccasin (Agkistrodon bilineatus). The Mexican moccasin, or cantil, is a dangerous snake of lowland regions from the Rio Grande to Nicaragua. About 3 ft (1 m) long, it is brown or black with narrow, irregular, whitish bars on its back and sides. See alsocopperhead.