/ Dictionary / Index I ides: Meaning and Definition of Find definitions for: ides Pronunciation: (īdz), [key] — n. (used with a sing. or pl. v.) (in the ancient Roman calendar) the fifteenth day of March, May, July, or October, and the thirteenth day of the other months. -ides Pronunciation: [key] a Greek plural suffix appearing in scientific names: cantharides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ides (Thesaurus) ideomotor id est* Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language