actinic ray

noun

, Physics.

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

Word History and Origins

Origin of actinic ray¹

First recorded in 1835–45

Example Sentences

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg