Ides
From BiblePortal Wikipedia
Webster's Dictionary [1]
(n. pl.) The fifteenth day of March, May, July, and October, and the thirteenth day of the other months.
The Nuttall Encyclopedia [2]
The name given in the Roman calendar to certain days that divide the month; in March, May, July, and October they fall on the 15th, in the rest on the 13th.
