8 letters · 10 points in Scrabble
noun (mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light
noun (astronomy) a cluster of stars (or a small constellation)
originFrom Ancient Greek ἀστερισμός (asterismós, “a group of stars”), from ἀστήρ (astḗr, “star”). Analyzable as aster- + -ism.
Etymology from Wiktionary, CC BY-SA 3.0