phenytoin

noun
phe·nyt·o·in | \fə-ˈni-tə-wən \

Definition of phenytoin 

: a crystalline anticonvulsant compound C15H12N2O2 used in the form of its sodium salt in the treatment of epilepsy

called also diphenylhydantoin

First Known Use of phenytoin

1941, in the meaning defined above

History and Etymology for phenytoin

diphenylhydantoin

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The first known use of phenytoin was in 1941

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phenytoin

noun
phe·nyt·o·in | \fə-ˈnit-ə-wən \

Medical Definition of phenytoin 

: an anticonvulsant used often in the form of its sodium salt C15H11N2NaO2 to prevent or treat seizures

called also diphenylhydantoin

— see dilantin

More from Merriam-Webster on phenytoin

Britannica.com: Encyclopedia article about phenytoin

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