Crossword Genius

Periodic trig function (4)

Ross

I believe the answer is:

sine

(Other definitions for sine that I've seen before include "Trigonometric function" , "Without; maths function" , "Latin tag for indefinitely - . . . . die" , "Opposite/hypoteneuse" , "Indefinitely, with no appointed date - . . . . die" .)

I've seen this clue in the Universal.
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