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[fen-i-toh-in, fuh-nit-oh-] /ˌfɛn ɪˈtoʊ ɪn, fəˈnɪt oʊ-/
noun, Pharmacology
a barbiturate-related substance, C 1 5 H 1 2 N 2 O 2 , used as an anticonvulsant in the treatment of grand mal epilepsy and in focal seizures.
Origin of phenytoin
1940-45; (di)pheny(lhydan)toin, its full chemical name; see di-1, phenyl, hydantoin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for phenytoin
  • Also, despite cessation of phenytoin, the patient's rash persisted.
  • phenytoin is a medicine used to treat convulsions and seizures.
  • phenytoin overdose occurs when someone takes too much of this medicine.
  • Drugs used for treating epilepsy, such as phenytoin and carbamazepine, can reduce thyroid levels.
British Dictionary definitions for phenytoin


an anticonvulsant drug used in the management of epilepsy and in the treatment of abnormal heart rhythms. Formula: C15H11N2O2Na Also called diphenylhydantoin sodium
Word Origin
C20: from (di)pheny(lhydan)toin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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phenytoin in Medicine

phenytoin phen·y·to·in (fěn'ĭ-tō'ĭn, fə-nĭt'ō-)
An anticonvulsant drug chemically related to the barbiturates and used most commonly in the treatment of epilepsy.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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