/ Dictionary / Index D deep-sea: Meaning and Definition of Find definitions for: deep-sea Pronunciation: (dēp'sē'), [key] — adj. of, pertaining to, in, or associated with the deeper parts of the sea: deep-sea fishing; deep-sea diver. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: deep-sea (Thesaurus) deep scattering layer deep-sea core Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language