ommatidium Meaning, Definition & Usage

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

WordNet

Om`ma*tid"i*um noun
Etymology
NL., dim. of Gr. , , the eye.
Wordforms
plural Ommatidia
Definitions
  1. (Zoöl.) One of the single eyes forming the compound eyes of crustaceans, insects, and other invertebrates.

Webster 1913