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photoinactivation

(fō′tō-ĭn-ăk′tə-vāshən)
n.
  1. Inactivation, as of a substance, by light.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.