Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. See water moccasin.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An oral dryness often associated with certain medicines and recreational drugs.
  • n. A snake, Agkistrodon piscivorus, the water moccasin.
  • n. A snake, Agkistrodon contortrix mokasen, the northern copperhead.

from the GNU version of the Collaborative International Dictionary of English

  • n. venomous semiaquatic snake (Agkistrodon piscivorus) of swamps in southern U.S.; -- called also water moccasin, cottonmouth moccasin, and cottonmouth water moccasin. It grows to a length of about 4 feet. The name refers to the whiteness of the lips and inside of the mouth.

from The Century Dictionary and Cyclopedia

  • n. A venomous serpent of the southern United States, a species of moccasin or Trigonocephalus: so called from a white streak along the lips.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. venomous semiaquatic snake of swamps in southern United States

Etymologies

From the white interior of its mouth.
(American Heritage® Dictionary of the English Language, Fourth Edition)
cotton +‎ mouth (Wiktionary)

Examples

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