/ Dictionary / Index E endomembrane: Meaning and Definition of Find definitions for: en•do•mem•brane Pronunciation: (en'dō-mem"brān), [key] — n. Cell. Biol. the outer membrane of any of the organelles within the cell. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. endolymph endometrial aspiration 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