/ Dictionary / Index E epenthesis: Meaning and Definition of Find definitions for: ep•en•the•sis Pronunciation: (u-pen'thu-sis), [key] — pl. -ses the insertion of one or more sounds in the middle of a word, as the schwa in the nonstandard pronunciationof elm. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: epenthesis (Thesaurus) ependyma epenthesize Related Content Daily Word Quiz: alacrity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language