actinic

adjective

ac·tin·ic | \ ak-ˈti-nik

Definition of actinic

: of, relating to, resulting from, or exhibiting chemical changes produced by radiant energy especially in the visible and ultraviolet parts of the spectrum actinic light actinic keratosis

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Rupert Craven undergoes a biopsy of an actinic keratosis in Herfurt’s clinic. — Karla Adam, Washington Post, "Britain braces for an exodus of E.U. doctors and nurses feeling hurt by Brexit," 4 Mar. 2018 Another summary concludes that nicotinamide acts in several ways to reduce actinic keratoses (your rough spots) and nonmelanoma skin cancers (Australasian Journal of Dermatology, August 2017). — Joe, The Seattle Times, "Can a vitamin really help prevent skin cancer?," 24 Dec. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'actinic.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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The first known use of actinic was in 1845

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actinic

adjective

ac·tin·ic | \ ak-ˈtin-ik

Medical Definition of actinic

: of, relating to, resulting from, or exhibiting chemical changes produced by radiant energy especially in the visible and ultraviolet parts of the spectrum actinic injury and carcinogenesis —Journal of the American Medical Association actinic keratosis