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See more synonyms for trimethadione on Thesaurus.com
noun Pharmacology.
  1. a synthetic, white, crystalline powder, C6H9NO3, used as an anticonvulsant to control petit mal epileptic seizures.
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Origin of trimethadione

trimeth(yl) + (ox)a(zolidine)dione, components of its chemical name
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for trimethadione


  1. a crystalline compound with a bitter taste and camphor-like odour, used in the treatment of epilepsy. Formula: C 6 H 9 NO 3
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Word Origin

from tri- + meth (yl) + di- 1 + -one
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

trimethadione in Medicine


  1. A white crystalline substance used as an anticonvulsant in the treatment of epilepsy.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.