Crossword Genius

Pi Day follower (4)

Ross

I believe the answer is:

ides

(Other definitions for ides that I've seen before include "date for 21 [ROMAN]?" , "Caesar was killed in this side of March" , "Julius Caesar died in these March days" , "13th or 15th day of the month in Roman calendar" , "Period in month" .)

I've seen this clue in the Universal and the LA Times.
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