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dioxygenase

(dī-ŏksĭ-jə-nās′, -nāz′)
n.
  1. Any of a group of enzymes that catalyze the insertion of an oxygen molecule into an organic substrate.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.