actinic

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Concise Oxford English Dictionary © 2008 Oxford University Press:
actinic /akˈtɪnɪk/

▶adjective technical (of light or lighting) able to cause photochemical reactions, as in photography, through having a significant short-wavelength or ultraviolet component.

– derivatives
actinism noun.

– origin C19: from Gk aktis, aktin- ‘ray’ + -ic.

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