1A large, dangerous semiaquatic pit viper that inhabits lowland swamps and waterways of the southeastern US. When threatening it opens its mouth wide to display the white interior.Also called water moccasin
Agkistrodon piscivorus, family Viperidae
2(also cotton mouth)US informal Dryness of the mouth.
- ‘I often have cotton mouth and a headache when I wake up’
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