/ Dictionary / Index D definitive host: Meaning and Definition of Find definitions for: defin'itive host' Pronunciation: [key] — Zool. Zool. the host in or on which a parasite spends the sexual stage of its life cycle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. definitive definitive plumage Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language