/ Dictionary / Index E ectocommensal: Meaning and Definition of Find definitions for: ec•to•com•men•sal Pronunciation: (ek"tō-ku-men'sul), [key] — adj. (of an organism) living in a commensal relationship on the exterior of another organism. —n. an ectocommensal organism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ectoblast ectocornea Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language