actinic

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ac·tin·ic

(ak-tin'ik),
Relating to the chemically active rays of the electromagnetic spectrum.
[G. aktis (aktin-), a ray]
Farlex Partner Medical Dictionary © Farlex 2012

ac·tin·ic

(ak-tin'ik)
Relating to the chemically active rays of the electromagnetic spectrum, particularly to sunlight.
[G. aktis (aktin-), a ray]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

actinic

Pertaining to radiation from the sun or to the biological effects of sunlight. Public awareness of the dangers of actinic radiation, and especially of its role in the production of BASAL CELL CARCINOMA (rodent ulcer), SQUAMOUS CELL CARCINOMA, MALIGNANT MELANOMA and PTERYGIUM has been growing in recent years and has somewhat diminished enthusiasm for sunbathing.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

actinic 

Pertaining to the chemical activity of radiant energy (especially ultraviolet) on absorption by certain substances. In the eye, the cornea, in particular, but also the lens and retina are most susceptible. See eclipse blindness; solar retinopathy.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann