ultraviolet_illumination has definitions from the field of physics
1
[ noun ] (physics) radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays

Used in print

(Walter H. Buchsbaum, "Advances in Medical Electronics"...)

Where the microscope under visible_light may show only vague shadows or nothing at_all , ultraviolet_illumination and subsequent translation into a color TV picture reveal a wealth of detail .

Related terms

actinic_radiation sun-ray

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