Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of ommatidium is as below...

Retinophora :: Retinophora (n.) One of group of two to four united cells which occupy the axial part of the ocelli, or ommatidia, of the eyes of invertebrates, and contain the terminal nerve fibrillae. See Illust. under Ommatidium..

Retinula :: Retinula (n.) One of the group of pigmented cells which surround the retinophorae of invertebrates. See Illust. under Ommatidium.

Ommatidium :: Ommatidium (n.) One of the single eyes forming the compound eyes of crustaceans, insects, and other invertebrates..

Rhabdom :: Rhabdom (n.) One of numerous minute rodlike structures formed of two or more cells situated behind the retinulae in the compound eyes of insects, etc. See Illust. under Ommatidium..

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