phenylephrine phenylenediamine • phenyl ether · · · Info · Definitions · Characters · · phenylephrine · · Text Latin · · Script 13 · · Length 4 · · Syllables Definitions · · · (noun) a powerful vasoconstrictor used to dilate the pupils and relieve nasal congestion. · · Noun Definition 1 Characters · · e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E p latin small letter p U+0070 r latin small letter r U+0072 y latin small letter y U+0079