10 letters · 13 points in Scrabble
noun the inverse function of the tangent; the angle that has a tangent 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 *teh₂g- Proto-Italic *tangō Latin tangō Latin tangēns Latin tangentembor. English tangent English arctangent From arc- + tangent.
Etymology from Wiktionary, CC BY-SA 3.0