diphenylhydantoin

[ dahy-fen-l-hahy-dan-toh-in, -feen- ]
/ daɪˈfɛn l haɪˈdæn toʊ ɪn, -ˈfin- /

noun Pharmacology.

a white, slightly water-soluble powder, C15H11N2O2, used in the form of its sodium salt to prevent or arrest convulsions in epilepsy.

Origin of diphenylhydantoin

First recorded in 1935–40; diphenyl + hydantoin