[om-uh-tid-ee-uh m]
noun, plural om·ma·tid·i·a [om-uh-tid-ee-uh] /ˌɒm əˈtɪd i ə/. Zoology.
  1. one of the radial elements composing a compound eye.

Origin of ommatidium

1880–85; < New Latin < Greek ommat- (stem of ómma eye) + New Latin -idium -idium
Related formsom·ma·tid·i·al, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of ommatidium

British Dictionary definitions for ommatidium


noun plural -tidia (-ˈtɪdɪə)
  1. any of the numerous cone-shaped units that make up the compound eyes of some arthropods
Derived Formsommatidial, adjective

Word Origin for ommatidium

C19: via New Latin from Greek ommatidion, from omma eye
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

ommatidium in Science


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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.