/ Dictionary / Index E endosymbiont: Meaning and Definition of Find definitions for: en•do•sym•bi•ont Pronunciation: (en"dō-sim'bē-ont", -bī-), [key] — n. a symbiont that lives within the body of the host. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. endosulfan endosymbiosis Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language