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actinismA nonspecific term of waning use for any effect of radiant (solar) energy on biological or chemical systems.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
actinism(ak′tĭ-nĭzm) [actin- + -ism]
The property of radiant energy that produces chemical changes, as in photography or heliotherapy.
Medical Dictionary, © 2009 Farlex and Partners