[ om-uh-tid-ee-uh m ]
/ ˌɒm əˈtɪd i əm /

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

one of the radial elements composing a compound eye.

Nearby words

  1. omit,
  2. omittance,
  3. omiya,
  4. omm,
  5. ommateum,
  6. ommatophore,
  7. ommiad,
  8. omn. bih.,
  9. omn. hor.,
  10. omn. man.

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. 2019

Examples from the Web for ommatidia

British Dictionary definitions for ommatidia


/ (ˌɒməˈtɪdɪəm) /

noun plural -tidia (-ˈtɪdɪə)

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

Science definitions for ommatidia


[ ŏm′ə-tĭdē-əm ]

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 Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.