Dictionary![]() ![]() idesPronunciation: (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. -idesa Greek plural suffix appearing in scientific names: cantharides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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