sine
sine [sine sines] BrE [saɪn] NAmE [saɪn] noun (abbr.sin) (mathematics)
the ↑ratio of the length of the side opposite one of the angles in a ↑right-angled triangle that are less than 90° to the length of the longest side
compare ↑cosine, ↑tangent
Word Origin:
late 16th cent.: from Latin sinus ‘curve’, used in medieval Latin as a translation of Arabic jayb ‘pocket, sine’.
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