7 letters · 9 points in Scrabble
noun the inverse function of the sine; the angle that has a sine equal to a given number
originEtymology tree Proto-Indo-European *h₂erkʷ- Proto-Indo-European *h₂erkʷos Proto-Italic *arkuos Latin arcusder. English arc- Proto-Indo-European *sinos Proto-Italic *sinus Latin sinusbor. English sine English arcsine From arc- + sine.
Etymology from Wiktionary, CC BY-SA 3.0