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tan (tan)   a light brown color. In persons with light-colored skin, this color is acquired by sun or ultraviolet exposure. The change results from darkening of preformed melanin (the Meirowsky phenomenon), accelerated formation of new melanin, and retention of melanin in the epidermis as a result of retardation of keratinization.
  to become such a light brown color from exposure to sun or to ultraviolet radiation; said of the skin of persons having naturally white to light brown skin.




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