/ Dictionary / Index E epizoon: Meaning and Definition of Find definitions for: ep•i•zo•on Pronunciation: (ep"u-zō'on, -un), [key] — pl. -zo•a an external parasite or commensal on the body of an animal; ectozoon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: epizoon (Thesaurus) epizoic epizootic Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language