10 letters · 17 points in Scrabble
noun any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods
originFrom Ancient Greek ὀμματίδιον (ommatídion, “little eye”), equivalent to ὄμμα (ómma, stem ὄμματ-) + -idium.
Etymology from Wiktionary, CC BY-SA 3.0