actinism

[ak-tuh-niz-uhm]
noun
the property of radiation by which chemical effects are produced.

Origin:
1835–45; actin- + -ism

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World English Dictionary
actinic (ækˈtɪnɪk)
 
adj
(of radiation) producing a photochemical effect
 
[C19: from actino- + -ic]
 
ac'tinically
 
adv
 
'actinism
 
n

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Example sentences
Solar actinism was shorn of its strength, which had tended to longevity and the large forms of life.
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