Dictionary.com
definitions

retinula

[ri-tin-yuh-luh]
noun, plural re·tin·u·lae [ri-tin-yuh-lee] /rɪˈtɪn yəˌli/. Anatomy.
  1. a group of elongate neural receptor cells forming part of an arthropod compound eye: each retinula cell leads to a nerve fiber passing to the optic ganglion.

Origin of retinula

From New Latin, dating back to 1875–80; see origin at retina, -ule
Related formsre·tin·u·lar, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for retinula

Historical Examples of retinula