pertaining to actinism.

1835–45; actin- + -ic

actinically, adverb
nonactinic, adjective
nonactinically, adverb
unactinic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
actinic (ækˈtɪnɪk)
(of radiation) producing a photochemical effect
[C19: from actino- + -ic]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

actinic ac·tin·ic (āk-tĭn'ĭk)
Of or relating to the chemically active rays of the electromagnetic spectrum.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Consistent sunburns can increase your risk of developing skin diseases, such as skin cancer, actinic keratoses and liver spots.
Actinic keratosis is a precancerous skin lesion that rarely may become a squamous cell cancer.
Actinic lights are used in aquariums to encourage plant and coral growth.
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