mephenytoin mephaquine • Mephisto · · · Info · Definitions · Synonyms · Characters · · mephenytoin · · Text Latin · · Script 11 · · Length 4 · · Syllables Definitions · · · (noun) a toxic anticonvulsant drug (trade name Mesantoin) used in the treatment of epilepsy when less toxic anticonvulsants have been ineffective. Synonyms: Mesantoin. · · Noun Definition 1 Synonyms · · · mesantoin · · Synonym 1 Characters · · e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 t latin small letter t U+0074 y latin small letter y U+0079