[fen-i-toh-in, fuh-nit-oh-]
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.

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. 2014.
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World English Dictionary
phenytoin (ˌfɛnɪˈtəʊɪn)
Also called: diphenylhydantoin sodium an anticonvulsant drug used in the management of epilepsy and in the treatment of abnormal heart rhythms. Formula: C15H11N2O2Na
[C20: from (di)pheny(lhydan)toin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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Example sentences
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.
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