Borrowed from Latin sinus ("curve, bend; bosom"), a translation of Arabic جَيْب ("bosom"), a misidentification of the notation جيب (jyb), written without vowel diacritics, standing for Arabic جِيبَ ("sine"), in turn from Sanskrit ज्या ("sine, chord, bowstring") through the similar Sanskrit जीव ("sine, chord, life, existence"). sinus.
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