noun, plural cottonmouths [kot-n-mouths, -mouthz] .
a venomous snake, Agkistrodon (Ancistrodon ) piscivorus, of swamps in southeastern U.S., that grows to about 4 feet (1.2 meters).
Also called water moccasin.

1825–35, Americanism; cotton + mouth, so called from the whiteness of its lips and mouth Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cottonmouth (ˈkɒtənˌmaʊθ)
another name for the water moccasin

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The cottonmouth has a heavy body and large triangular shaped head.
The following steps are optional for rattlesnake, copperhead and cottonmouth bites only.
The cottonmouth will stand its ground or even approach an intruder.
Most of them are harmless, but the venomous cottonmouth is also present.
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