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hard rays

hard rays in Medicine

hard rays pl.n.
Radiation of short wavelength and great penetrability.

The American HeritageĀ® Stedman's Medical Dictionary
Copyright Ā© 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Historical Examples
  • Cold, hard rays penetrate through the immense ruin, separating with a sharp incisiveness the light from the shadows.

  • In the Solar System, the greatest single source of radiation, including the hard rays, was the Sun.

    The Impossible Voyage Home Floyd L. Wallace

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