/ Dictionary / Index P phenylacetic acid: Meaning and Definition of Find definitions for: phen'ylace'tic ac'id Pronunciation: [key] — Chem. Chem. a white crystalline, aromatic acid, CHO, used in the manufacture of penicillin and in perfumes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phenyl acetate phenylalanine Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language