ommatidium

noun
om·​ma·​tid·​i·​um | \ ˌä-mə-ˈti-dē-əm How to pronounce ommatidium (audio) \
plural ommatidia\ ˌä-​mə-​ˈti-​dē-​ə How to pronounce ommatidium (audio) \

Definition of ommatidium

: one of the elements corresponding to a small simple eye that make up the compound eye of an arthropod

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Other Words from ommatidium

ommatidial \ ˌä-​mə-​ˈti-​dē-​əl How to pronounce ommatidium (audio) \ adjective

Examples of ommatidium in a Sentence

Recent Examples on the Web In this kind of compound eye, each ommatidium has to be encased in something that blocks light in order to isolate it from the neighboring ommatidia, keeping each unit distinct. Scott K. Johnson, Ars Technica, 15 Aug. 2020 At the top of each ommatidium is a lens, with cone cells beneath it that also help focus incoming light. Scott K. Johnson, Ars Technica, 15 Aug. 2020 The tiny organ contains 100 ommatidia, or subunits that make up compound eyes found today in many insects, surrounding a light-sensing structure called a rhabdom. Jason Daley, Smithsonian, 11 Dec. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ommatidium.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of ommatidium

1884, in the meaning defined above

History and Etymology for ommatidium

New Latin, from Greek ommat-, omma eye; akin to Greek ōps eye — more at eye

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Time Traveler for ommatidium

Time Traveler

The first known use of ommatidium was in 1884

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Dictionary Entries Near ommatidium

Ommastrephes

ommateal

ommateum

ommatidium

ommatin

ommatophore

Ommiad

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Cite this Entry

“Ommatidium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ommatidium. Accessed 26 Jul. 2021.

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More from Merriam-Webster on ommatidium

Britannica.com: Encyclopedia article about ommatidium

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