10 letters · 19 points in Scrabble
adjective having no hue
originFrom Ancient Greek ἀχρωμάτιστος (akhrōmátistos, “uncolored”), from ἀ- (a-, “not”) + χρῶμα (khrôma, “color”), equivalent to a- + chromatic; compare French achromatique.
Etymology from Wiktionary, CC BY-SA 3.0