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grenz rays

noun
  1. physics X-rays of long wavelength produced in a device when electrons are accelerated through 25 kilovolts or less
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Word Origin for grenz rays

C20: from grenz from German Grenze boundary
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

grenz rays in Medicine

grenz rays

(grĕnts)
pl.n.
  1. Very soft x-rays, closely allied to ultraviolet rays in their wavelength and in their biological action upon tissues.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.