actinic ray

American  

noun

Physics.

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

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Etymology

Origin of actinic ray

First recorded in 1835–45

Example Sentences

An actinic ray from the lantern striking the plate will fog it.

From Harper's Round Table, May 28, 1895 by Various

Elusive, delicate, alluring—it is the actinic ray that imparts vitality.

From Little Journeys to the Homes of the Great - Volume 01 Little Journeys to the Homes of Good Men and Great by Hubbard, Elbert

And I am not sure but that sympathy is love's own self, vitalized mayhap by some divine actinic ray.

From Little Journeys to the Homes of the Great - Volume 02 Little Journeys To the Homes of Famous Women by Hubbard, Elbert

The second point of value consists in allowing the actinic ray in the sunlight to act upon the chlorophyl in bud and bark of the scion and it does not attract the destructive heat ray.

From Northern Nut Growers Association, Report Of The Proceedings At The Tenth Annual Meeting. Battle Creek, Michigan, December 9 and 10, 1919 by Northern Nut Growers Association

The question is, then, what teaching concern in America supplies the best quality of actinic ray?

From Little Journeys to the Homes of the Great - Volume 10 Little Journeys To The Homes Of Great Teachers by Hubbard, Elbert