9 letters · 11 points in Scrabble
adjective (of a triangle) having two sides of equal length
originBorrowed from Latin īsoscelēs, from Ancient Greek ἰσοσκελής (isoskelḗs, “equal-legged”), from ἴσος (ísos, “equal”) + σκέλος (skélos, “leg”) + -ής (-ḗs, adjective suffix). See also iso-.
Etymology from Wiktionary, CC BY-SA 3.0