grenz rays

World English Dictionary
grenz rays (ɡrɛnz)
 
n
physics X-rays of long wavelength produced in a device when electrons are accelerated through 25 kilovolts or less
 
[C20: from grenz from German Grenze boundary]

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American Heritage
Medical Dictionary

grenz rays (grěnts)
pl.n.
Very soft x-rays, closely allied to ultraviolet rays in their wavelength and in their biological action upon tissues.

The American Heritage® Stedman's Medical Dictionary
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