Etymology
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sine (n.)

one of the three fundamental functions of trigonometry,  1590s (in Thomas Fale's "Horologiographia, the Art of Dialling"), from Latin sinus "fold in a garment, bend, curve, bosom" (see sinus). Used mid-12c. by Gherardo of Cremona in Medieval Latin translation of Arabic geometrical text to render Arabic jiba "chord of an arc, sine" (from Sanskrit jya "bowstring"), which he confused with jaib "bundle, bosom, fold in a garment."

updated on March 19, 2022

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Definitions of sine from WordNet

sine (n.)
ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle;
Synonyms: sin
From wordnet.princeton.edu, not affiliated with etymonline.