actinic keratosis

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English[edit]

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Noun[edit]

actinic keratosis (plural actinic keratoses)

  1. (medicine) A lesion on the skin, typically on the upper portion of the head, characterized by discolored, thickened or scaly growths of keratin, caused by exposure to the sun; common in fair-complected people of a certain age. They are precancerous.