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Definition of retina noun from the Oxford Advanced American Dictionary

retina

noun
/ˈrɛtnə/ retina pronunciation American
plural retinasorretinae
/ˈrɛtni/ retinae pronunciation American
 
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 retinal
/ˈrɛtnəl/ retinal pronunciation American
[usually before noun], adjective