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Wood's lamp

(wudz)
n.
  1. An ultraviolet lamp with a nickel oxide filter that only allows light with a maximal wavelength of about 3660 angstroms to be emitted; it is used to detect hairs that are infected with Microsporum fungi.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.