actinic

1. (by extension) Harsh and bright, especially blindingly so.Examples: "He bounded over cresting waves that shone in the actinic glare."; "And what actinic, mind-wrenching form could the countermeme take? How could human hands assemble something so devastatingly powerful and hold it steady; what human mind could wield it without exploding from the inside out?"broadlynot-comparable

2. (medicine) Caused by extensive exposure to ultraviolet light.Examples: "In medicine, actinic keratoses usually occur in sundamaged skin and exhibit hyperkeratosis."not-comparable

3. (chemistry, photography) Of or relating to actinism, the range of photochemical effects produced by exposure to electromagnetic radiation, particularly sunlight.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."; "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."not-comparable