noun, plural ommatidia [om-uh-tid-ee-uh] . Zoology.
one of the radial elements composing a compound eye.

1880–85; < Neo-Latin < Greek ommat- (stem of ómma eye) + Neo-Latin -idium -idium

ommatidial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ommatidium (ˌɒməˈtɪdɪəm)
n , pl -tidia
any of the numerous cone-shaped units that make up the compound eyes of some arthropods
[C19: via New Latin from Greek ommatidion, from omma eye]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
ommatidium   (ŏm'ə-tĭd'ē-əm)  Pronunciation Key 
Plural ommatidia
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.
The American Heritage® Science Dictionary
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