Ommatidium

• POS: Noun
• HYPHEN: om=ma=tid=i=um

CIDE DICTIONARY

Ommatidium, n. [NL., dim. of Gr. , , the eye.].

 One of the single eyes forming the compound eyes of crustaceans, insects, and other invertebrates; one of the eyes of an ommateum.  [1913 Webster]

OXFORD DICTIONARY

Ommatidium, n. (pl. ommatidia) a structural element in the compound eye of an insect.

Etymology

mod.L f. Gk ommatidion dimin. of omma ommat- eye