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WordReference Random House Learner's Dictionary of American English © 2024ret•i•na /ˈrɛtənə/USA pronunciation n. [countable], pl. ret•i•nas, ret•i•nae /ˈrɛtəˌni/.USA pronunciation - Ophthalmologythe innermost coat of the back part of the eyeball that receives the image produced by the lens:The retina meets the optic nerve.
WordReference Random House Unabridged Dictionary of American English © 2024ret•i•na (ret′n ə, ret′nə),USA pronunciation n., pl. ret•i•nas, ret•i•nae (ret′n ē′).USA pronunciation [Anat.]- Anatomythe innermost coat of the posterior part of the eyeball that receives the image produced by the lens, is continuous with the optic nerve, and consists of several layers, one of which contains the rods and cones that are sensitive to light. See diag. under eye.
- Medieval Latin rētina, perh. equivalent. to Latin rēt- (stem of rēte) net + -ina -ine1
- Middle English ret(h)ina 1350–1400
- Trademarks, Drugsa brand of tretinoin, used esp. to reduce wrinkles caused by overexposure to the sun.
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