phenergan phenene • phenethyl · · · Info · Definitions · Synonyms · Characters · · phenergan · · Text Latin · · Script 9 · · Length 3 · · Syllables Definitions · · · (noun) antihistamine (trade name Phenergan) used to treat allergies; also an antiemetic used to treat motion sickness. Synonyms: promethazine, Phenergan. · · Noun Definition 1 Synonyms · · · promethazine · · Synonym 1 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 h latin small letter h U+0068 n latin small letter n U+006E p latin small letter p U+0070 r latin small letter r U+0072