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See more synonyms for cottonmouth on Thesaurus.com
noun, plural cot·ton·mouths [kot-n-mouths, -mouth z] /ˈkɒt nˌmaʊθs, -ˌmaʊðz/.
  1. a venomous snake, Agkistrodon (Ancistrodon) piscivorus, of swamps in southeastern U.S., that grows to about 4 feet (1.2 meters).
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Origin of cottonmouth

1825–35, Americanism; cotton + mouth, so called from the whiteness of its lips and mouth
Also called water moccasin.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for cotton mouth


  1. another name for the water moccasin
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012