Fin″sen light (?). [After Prof. Niels R. Finsen (b. 1860), Danish physician.] (Med.) Highly actinic light, derived from sunlight or from some form of electric lamp, used in the treatment of lupus and other cutaneous affections.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.