Origin of actinic
Examples from the Web for actinic
It follows that the light emitted by the central axis of the tail greatly exceeds in actinic power the diffuse light around it.
It should be added that some people stand these actinic rays better than others.The Land of Footprints|Stewart Edward White
The bleaching power of light depends on its actinic or chemical rays, which, like chlorine, appear to act as an oxidising agent.
When any of these mixtures are submitted to the action of actinic light, they become more or less insoluble.The Barnet Book of Photography|Various
Not actinic—alchemic—some intangible mysterious power which cannot be supplied in any other form but the sun's rays.The Open Air|Richard Jefferies