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

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