Ommatidium

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Ommatidium \Om`ma*tid"i*um\, n.; pl. {Ommatidia}. [NL., dim. of
     Gr. ?, ?, the eye.] (Zool.)
     One of the single eyes forming the compound eyes of
     crustaceans, insects, and other invertebrates; one of the
     eyes of an ommateum.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

  ommatidium
       n : any of the numerous small cone-shaped eyes that make up the
           compound eyes of some arthropods
       [also: {ommatidia} (pl)]