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(ˈrɛt n ə, ˈrɛt nə)

n., pl. ret•i•nas, ret•i•nae (ˈrɛt nˌi)
the 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.
[1350–1400; Middle English ret(h)ina < Medieval Latin rētina, perhaps = Latin rēt-, s. of rēte net + -ina -ine3]


(ˌrɛt nˈeɪ)
a brand of tretinoin, used esp. to reduce wrinkles caused by overexposure to the sun.


n. Retin-A, nombre comercial del ácido retinoico, medicamento usado en el tratamiento de acné.
References in periodicals archive ?
NYSE: VRX and TSX: VRX) announced today that it has received approval from the Food and Drug Administration (FDA) for its Supplemental New Drug Application (sNDA) for Retin-A Micro (tretinoin) Gel microsphere 0.
Retinol became well known shortly after Retin-A made headlines as a prescription wrinkle cream back in 1987.
BLEACH THE BROWN Consider a product that contains kojic acid, hydroquinone, Retin-A, and a mild steroid cream.
I have Retin-A but my spots are coming back already.
If you are using a product with tretinoin, such as Retin-A or Renova, be especially vigilant about wearing sunscreen--you are more liable to sustain a sunburn.
Do Renova and Retin-A work to reduce acne and wrinkles?
The most common prescription medications applied to the skin are retinoid creams such as Retin-A and topical antibiotics such as erythromycin.
To illustrate her point, she noted that rosacea patients respond quite differently to Retin-A 0.
What Differin and Retin-A do is make the cells no longer sticky, meaning pores won't clog.
Retin-A turned out to be a weak tumor promoter, but Forbes later found that drugs used to treat psoriasis and a new class of very effective oral antibiotics, the fluoroquinolones, produce serious sunburns and rashes in patients.
Derived from vitamin A, Retin-A catapulted us into a new age of skincare, where creams are more than short-lived plumping of fine lines with mixtures of oil and water.
Like Retin-A (tretinoin), the prescription drug used to treat wrinkles, tazarotene slows down abnormal growth of skin cells, excess skin shedding, and inflammation, all of which contribute to the development of acne and psoriasis.