om·ma·tid·i·um /ˌɑməˈtɪdiəm/
Om·ma·tid·i·um n.; pl. Ommatidia Zool. One of the single eyes forming the compound eyes of crustaceans, insects, and other invertebrates; one of the eyes of an ommateum.
◄ ►
ommatidium
n : any of the numerous small cone-shaped eyes that make up the
compound eyes of some arthropods
[also: ommatidia (pl)]