/ Dictionary / Index E endoplasm: Meaning and Definition of Find definitions for: en•do•plasm Pronunciation: (en'du-plaz"um), [key] — n. Cell Biol. the inner portion of the cytoplasm of a cell. Cf. ectoplasm (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: endoplasm (Thesaurus) endophyte endoplasmic reticulum 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