Definition of phenytoin
: a crystalline anticonvulsant compound C15H12N2O2 used in the form of its sodium salt in the treatment of epilepsy —called also diphenylhydantoin
Origin and Etymology of phenytoin
First Known Use: 1941See Words from the same year
Learn More about phenytoin
Britannica.com: Encyclopedia article about phenytoin
Seen and Heard
What made you want to look up phenytoin? Please tell us where you read or heard it (including the quote, if possible).