- the cottonmouth.
- any of various similar but harmless snakes, as a water snake of the genus Nerodia.
Origin of water moccasin
An Americanism dating back to 1815–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for water moccasin
The water-moccasin will not trouble you if you let him alone.Down South
The water-moccasin (Agkistrodon piscivorous) is dark chestnut-brown with darker markings.Elementary Zoology, Second Edition
Vernon L. Kellogg
The water-moccasin is about two feet in length, and has a circumference of five or six inches.Voyage of the Paper Canoe
Nathaniel H. Bishop
- a large dark grey venomous snake, Agkistrodon piscivorus, of swamps in the southern US: family Crotalidae (pit vipers)Also called: cottonmouth