
• (n.) One of the group of pigmented cells which surround the retinophorae of invertebrates. See Illust. under Ommatidium.
Found on
http://thinkexist.com/dictionary/meaning/retinula/

(from the article `photoreception`) ...of the cuticle (the hard outer covering of arthropods) on the surface of the eye; four cells called Semper`s cells or cone cells, which form the ... ...(a part of the brain) by sensory axons. Each visual sense cell has a zone at its surface, which, on exposure to light, gives rise to chemical ... ...
Found on
http://www.britannica.com/eb/a-z/r/39
Re·tin'u·la noun ;
plural Retinulæ . [ New Latin , dim. of New Latin & English
retina .]
(Zoology) One of the group of pigmented cells which surround the retinophoræ of invertebrates. See
Illust. under
Ommatidium .
Found on
http://www.encyclo.co.uk/webster/R/67
No exact match found.