The story
- Proto-Indo-European*sinos
- Proto-Italic*sinus
- Arabicجِيبَ (jība)
- Latinsinus
- English todaysine
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.
Words from the same roots
Latinsinus all →
sinus
Sanskritजीव all →
jivajivatma
Etymology from Wiktionary, CC BY-SA 4.0.