Finsen light
noun
Fin·sen light
ˈfin(t)sən-,
-nzən-
: a mixture of blue, violet, and near ultraviolet light that is produced by a lamp using a high-temperature carbon arc or a mercury arc and that is used in the treatment of lupus and certain other skin conditions and in testing paints and other protective coatings
Word History
Etymology
after Niels R. Finsen †1904 Danish physician