/fen'i toh"in, feuh nit"oh-/ , n. Pharm.
a barbiturate-related substance, C 15 H 12 N 2 O 2 , used as an anticonvulsant in the treatment of grand mal epilepsy and in focal seizures.
[ 1940-45; ( di ) pheny ( lhydan ) toin, its full chemical name; see DI- 1 , PHENYL, HYDANTOIN ]