OMMATIDIUM

ommatidium

(noun) any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods

Source: WordNet® 3.1

Etymology

Noun

ommatidium (plural ommatidia)

(zoology) One of the conical substructures which make up the eyes of invertebrates with compound eyes.

Source: Wiktionary

Om`ma*tid"i*um, n.; pl. Ommatidia. Etym: [NL., dim. of Gr. (Zoöl.)

Definition: One of the single eyes forming the compound eyes of crustaceans, insects, and other invertebrates.

Source: Webster’s Unabridged Dictionary 1913 Edition

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