noun, plural om·ma·tid·i·a [om-uhtid-ee-uh] /ˌɒm əˈtɪd i ə/. Zoology.

  1. one of the radial elements composing a compound eye.

noun plural -tidia (-ˈtɪdɪə)

  1. any of the numerous cone-shaped units that make up the compound eyes of some arthropods

Plural ommatidia

  1. One of the tiny light-sensitive parts of the compound eye of insects and other arthropods. An ommatidium resembles a single simplified eye. See more at compound eye.
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