ac·​tin·​ic | \ ak-ˈti-nik How to pronounce actinic (audio) \

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

Other Words from actinic

actinically \ ak-​ˈti-​ni-​k(ə-​)lē How to pronounce actinic (audio) \ adverb

Examples of actinic in a Sentence

Recent Examples on the Web When used medically for treatment of actinic keratosis, the cost of photodynamic therapy may be covered by insurance, but don’t expect your insurance to cover it for acne, rosacea, or skin rejuvenation. Naomi Barr, SELF, 12 May 2022 The American Cancer Society also said that UV light can cause premature aging and signs of damage such as wrinkles, leather skin, liver spots, actinic keratosis and solar elastosis. Adrianna Rodriguez, USA TODAY, 4 Aug. 2020 After a lip sunburn, precancerous inflammation called actinic cheilitis (AC) can develop, and that could lead to squamous cell cancer. Claire Gillespie,, 2 July 2020 Unlike melanoma which is usually characterized by unusual moles, lumps and markings, actinic keratosis appears as small, dry, scaly or crusty patches of skin, according to the Skin Cancer Foundation. NBC News, 20 Feb. 2020 That said, Solaraze is a prescription topical medication used to treat actinic keratoses (scaly patches of skin that can be a precursor to skin cancer) containing 3% diclofenac in a 2.5% hyaluronic acid gel. Sarah Jacoby, SELF, 3 Oct. 2019 Rupert Craven undergoes a biopsy of an actinic keratosis in Herfurt’s clinic. Karla Adam, Washington Post, 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, 24 Dec. 2017 See More

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.

First Known Use of actinic

1845, in the meaning defined above

History and Etymology for actinic

Greek aktīn-, aktís "ray, beam" + -ic entry 1 — more at actin-

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Time Traveler for actinic

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The first known use of actinic was in 1845

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actinic focus

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Cite this Entry

“Actinic.” Dictionary, Merriam-Webster, Accessed 17 Aug. 2022.

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More Definitions for actinic


ac·​tin·​ic | \ ak-ˈtin-ik How to pronounce actinic (audio) \

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 carcinogenesisJournal of the American Medical Association actinic keratosis

Other Words from actinic

actinically \ -​i-​k(ə-​)lē How to pronounce actinic (audio) \ adverb


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