/ Dictionary / Index P phenylene group: Meaning and Definition of Find definitions for: phen'ylene group" Pronunciation: [key] — Chem. Chem. any of three bivalent, isomeric groups having the formula –CH–, derived from benzene by the removal of two hydrogen atoms. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phenylene phenylephrine Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language