actinic

ac·tin·ic

adj \ak-ˈtin-ik\

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>

—ac·tin·i·cal·ly \-i-k(ə-)lē\ adverb