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Tyndall phenomenon

(tĭndl)
n.
  1. The occurrence of visible floating particles in gases or liquids that are illuminated by a ray of sunlight and are viewed at right angles to the illuminating ray.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.