/ Dictionary / Index E ectosarc: Meaning and Definition of Find definitions for: ec•to•sarc Pronunciation: (ek'tu-särk"), [key] — n. Biol. the ectoplasm of a protozoan (opposed to endosarc). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ectoprocta ectostosis Related Content Daily Word Quiz: boorish Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language