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
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