/ Dictionary / Index W water moccasin: Meaning and Definition of Find definitions for: wa'ter moc"casin Pronunciation: [key] the cottonmouth. any of various similar but harmless snakes, as a water snake of the genus Nerodia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. water mill water mold Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language