ac·tin·ism

[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) [Click for IPA pronunciation guide]
 
adj
(of radiation) producing a photochemical effect
 
[C19: from actino- + -ic]
 
ac'tinically
 
adv
 
'actinism
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Actinism is always a great word to know.
So is zedonk. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
the offspring of a zebra and a donkey.
Example sentences
Solar actinism was shorn of its strength, which had tended to longevity and the large forms of life.
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