14 letters · 31 points in Scrabble
originCoined in the late 1880s as a back-formation from hypercatalectic, from Latin hypercatalēcticus, from Ancient Greek ὑπερκαταληκτικός (huperkatalēktikós), from ὑπερ- (huper-, “over”) + καταληκτικός (katalēktikós, “incomplete”)
Etymology from Wiktionary, CC BY-SA 3.0