/ Dictionary / Index U underwater: Meaning and Definition of Find definitions for: un•der•wa•ter Pronunciation: (un'dur-wô'tur, -wot'ur), [key] — adj. existing or occurring under water. designed to be used under water. located below a ship's waterline. —adv. beneath the water: to travel underwater. —n. the water beneath the surface: cold currents in the underwater. the depths, as of a sea, lake, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: underwater (Thesaurus) underwaist underwater archaeology Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language