/ Dictionary / Index W water cannon: Meaning and Definition of Find definitions for: wa'ter can"non Pronunciation: [key] a truck-mounted hose or pipe that shoots a jet of water through a nozzle at extremely high pressure, used esp. in dispersing rioters or demonstrators. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: watercannon (Thesaurus) water-bus water carrier Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language