noun (used with a singular or plural verb)
(in the ancient Roman calendar) the fifteenth day of March, May, July, or October, and the thirteenth day of the other months.

1300–50; Middle English < Old French < Latin īdūs (feminine plural); replacing Middle English idus < Latin Unabridged


a Greek plural suffix appearing in scientific names: cantharides.

< Greek, plural of -is, suffix of source or origin. See -id1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ides (aɪdz)
(functioning as singular) calends See also nones (in the Roman calendar) the 15th day in March, May, July, and October and the 13th day of each other month
[C15: from Old French, from Latin īdūs (plural), of uncertain origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

(pl.) early 14c., "middle day of a Roman month," from Fr. Ides (12c.), from L. idus, a word perhaps of Etruscan origin. The 15th of March, May, July, and October; the 13th of other months.
Online Etymology Dictionary, © 2010 Douglas Harper
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