/ Dictionary / Index E ethosuximide: Meaning and Definition of Find definitions for: eth•o•sux•i•mide Pronunciation: (eth"ō-suk'su-mīd"), [key] — n. Pharm. an anticonvulsant, CHNO, used in medicine to treat certain kinds of epilepsy, esp. petit mal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ethosuximide (Thesaurus) ethos ethoxide Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language