Definition of "phenytoin" [phenytoin]

• An anticonvulsant drug, C15H12N2O2, used most commonly in the treatment of epilepsy. Also called diphenylhydantoin. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Also a drug called phenytoin, which is a seizure medication."
• "This same therapist also wrote Debra a low-dose prescription for a drug called phenytoin, found to be useful in treating antisocial personality."
• "Anti-convulsant medications, such as phenytoin, are usually prescribed if seizures occur."