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2017 Word of the Year

actinic ray

noun, Physics.
1.
a ray of light of short wavelengths, as ultraviolet or violet, that produces photochemical effects.
Origin of actinic ray
1835-1845
First recorded in 1835-45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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11
14
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