Breadcrumb Home > Dictionary > Index U undersea: Meaning and Definition of Find definitions for: un•der•sea Pronunciation: (un'dur-sē"), [key] — adj. located, carried on, or used under the surface of the sea: undersea life. —adv. underseas. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: undersea (Thesaurus) underscore underseas TrendingHere are the facts and trivia that people are buzzing about. Did Birds Evolve from Dinosaurs? The Twelve Dancing Princesses Current Events This Week: January 2023 African Americans by the Numbers Andersen's Fairy Tales: Contents The Celtic Twilight: A Teller of Tales ✖ Related Content Daily Word Quiz: saturnine Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language