/ Dictionary / Index P phenylephrine: Meaning and Definition of Find definitions for: phen•yl•eph•rine Pronunciation: (fen"l-ef'rēn, -rin, fēn"-), [key] — n. Pharm. an alpha-adrenergic stimulant, CHNO, used chiefly as a nasal decongestant. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: phenylephrine (Thesaurus) phenylene group phenylethyl alcohol Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language