/ Dictionary / Index W water vapor: Meaning and Definition of Find definitions for: wa'ter va"por Pronunciation: [key] a dispersion, in air, of molecules of water, esp. as produced by evaporation at ambient temperatures rather than by boiling. Cf.(def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. water turkey water-vascular system Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language