ides

ides

[ahydz]
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.

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

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-ides

a Greek plural suffix appearing in scientific names: cantharides.

Origin:
< Greek, plural of -is, suffix of source or origin. See -id1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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ides (aɪdz)
 
n
(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]

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Word Origin & History

ides
(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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