/ Dictionary / Index E endotoxin: Meaning and Definition of Find definitions for: en•do•tox•in Pronunciation: (en"dō-tok'sin), [key] — n. Biochem. the toxic protoplasm liberated when a microorganism dies and disintegrates, as in Eberthella typhi, the causative agent of typhoid fever. Cf. exotoxin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: endotoxin (Thesaurus) endothermic endotracheal Related Content Daily Word Quiz: supercilious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language