Found 2 items, similar to ommatidium.
English → English (WordNet) Definition: ommatidium ommatidium n : any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods [also: ommatidia (pl)]
English → English (gcide) Definition: Ommatidium Ommatidium \Om`ma*tid"i*um\, n.; pl. Ommatidia. [NL., dim. of Gr. ?, ?, the eye.] (Zo["o]l.) One of the single eyes forming the compound eyes of crustaceans, insects, and other invertebrates; one of the eyes of an ommateum. [1913 Webster]