retina
ret·ina [retina retinas retinae] BrE [ˈretɪnə] NAmE [ˈretənə] noun (pl. ret·inasor ret·inaeBrE [ˈretɪniː] ; NAmE [ˈretəniː] )
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 
Derived Word: ↑retinal
Word Origin:
late Middle English: from medieval Latin, from Latin rete ‘net’.
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