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Related to radiation; used most often in reference to light, especially in the ultraviolet range. examples
(by extension) Harsh and bright. quotations examples
He bounded over cresting waves that shone in the actinic glare.
1999, Jody Lynn Nye, School of Light
(medicine) Caused by extensive exposure to ultraviolet light. examples
(chemistry or photography) Of or relating to actinism, the range of photochemical effects produced by exposure to EM radiation, particularly sunlight. quotations examples
It should be borne in mind that the actinic power of the sun is subject to considerable variations, due to its elevation above the horizon.
1883, Abraham Cowley Malley, Micro-photography: Including a Description of the Wet Collodion and Gelatino-Bromide Processes, page 32
I got my picture, and it turned out quite a good one, despite the rather poor light which at that time of day, 7 p.m., was lacking in actinic value.
1943 May and June, Chas. S. Lake, “Some Continental Travel Experiences (1922-1939)—III”, in Railway Magazine, page 141
Composed of actin. examples