Actinic

adj. of actinism, of the radiative property which produces photochemical activity

Actinism is a property of radiation (particularly solar radiation) that leads to the production of photochemical effects. Actinism is derived from Greek with the meaning a radiant force. The word actinism seems to be used particularly in terms of imaging technology especially photography although it is used in medical literature for photo-biochemical effects such as a sunburn or radiation exposure from ultraviolet rays and in chemistry for containers that protect from photo-degradation. Chemical photography and X-ray imaging are two applications of actinism.
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Adjective
1. relating to or exhibiting actinism
(pertainym) actinism

(a.)
Of or pertaining to actinism; as, actinic rays.
  

A precancerous condition of thick and scaly patches of skin; also called solar or senile keratosis.