/ Dictionary / Index S subsurface: Meaning and Definition of Find definitions for: sub•sur•face Pronunciation: (sub-sûr'fus, sub'sûr"-), [key] — adj. below the surface, esp. of a body of water. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: subsurface (Thesaurus) subsumption subsystem Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language