Definitions
ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
Word origin
Borrowed from Latin sinus (“curve, bend; bosom”), a translation of Arabic جَيْب (jayb, “bosom”), a misidentification of the notation جيب (j-y-b), written without vowel diacritics, standing for Arabic جِيبَ (jība, “sine”), in turn from Sanskrit ज्या (jyā, “sine, chord, bowstring”) through the similar Sanskrit जीव (jīva, “sine, chord, life, existence”). Doublet of sinus.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Trigonometry ratio”4 letters
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