phenytoin phenyltoloxamine • pheochromocytoma · · · Info · Definitions · Synonyms · Characters · · phenytoin · · Text Latin · · Script 9 · · Length 3 · · Syllables Definitions · · · (noun) an anticonvulsant drug (trade name Dilantin) used to treat epilepsy and that is not a sedative. Synonyms: diphenylhydantoin, Dilantin. · · Noun Definition 1 Synonyms · · · diphenylhydantoin · · Synonym 1 dilantin · · Synonym 2 Characters · · e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 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