Definition of cottonmouth in English:

cottonmouth

Pronunciation /ˈkätnˌmouTH/ /ˈkɑtnˌmaʊθ/

noun

  • 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.

    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’