/ Dictionary / Index P phyto-: Meaning and Definition of Find definitions for: phyto- Pronunciation: [key] a combining form meaning “plant,” used in the formation of compound words: phytogenesis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Phytin phytoalexin Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language