6 letters · 8 points in Scrabble
noun ratio of the adjacent side to the hypotenuse of a right-angled triangle
originEtymology tree Proto-Indo-European *ḱe? Proto-Indo-European *ḱóm Proto-Italic *kom Proto-Italic *kom- Latin con- Latin co-der. English co- Proto-Indo-European *sinos Proto-Italic *sinus Latin sinusbor. English sine English cosine From co- + sine, short for complementi sinus in Latin, meaning “sine of the complement”. Doublet of cosinus.
Etymology from Wiktionary, CC BY-SA 3.0