/ Dictionary / Index E exosmosis: Meaning and Definition of Find definitions for: ex•os•mo•sis Pronunciation: (ek"sos-mō'sis, ek"soz-), [key] — n. osmosis toward the outside of a cell or vessel. the flow of a substance from an area of greater concentration to one of lower concentration (opposed to endosmosis). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. exoskeleton exosphere Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language