Highly actinic light, derived from sunlight or from some form of electric lamp, used in the treatment of lupus and other cutaneous disorders.

plural of Finsen light

In a light-minded manner; frivolously or without serious consideration.

plural of light-heartedness

Alternative form of lightheartedness

Alternative form of lightheartedly

(archaic) X-ray radiation

(historical) A signal made by burning lights of different colours, used by vessels at sea, and in the life-saving service.

plural of Coston light

The state or quality of being light-handed.