Definition of retina noun from the Oxford Advanced American Dictionary

 

retina

 noun
noun
NAmE//ˈrɛtnæ#x2027ːə//
 
(pl. retinas, (or )retinae
NAmE//ˈrɛtnæ#x2027ːi//
 
)
 
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a layer of tissue at the back of the eye that is sensitive to light and sends signals to the brain about what is seen
NAmE//ˈrɛtnæ#x2027ːəl//
 
[usually before noun] adjective
See the Oxford Advanced Learner's Dictionary entry: retina