actinic ray

actinic ray

noun Physics.
a ray of light of short wavelengths, as ultraviolet or violet, that produces photochemical effects.

Origin:
1835–45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Actinic ray is always a great word to know.
So is thermal conductivity. Does it mean:
nonmechanical energy transfer with reference to a temperature difference between a system and its surroundings
the amount of heat per unit time per area that can be conducted through a plate of thickness of a given material, differing by one unit of temperature
WordNet
actinic ray

noun
electromagnetic radiation that can produce photochemical reactions [syn: actinic radiation
WordNet® 3.0, © 2006 by Princeton University.
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