/ Dictionary / Index P phosphoryl group: Meaning and Definition of Find definitions for: phos'pho•ryl group" Pronunciation: (fos'fu-ril), [key] — Chem. Chem. the trivalent group ≡P≡O. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phosphorylate phosphureted Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language