dioxygenase

[ dī-ŏksĭ-jə-nās′, -nāz′ ]

n.

Any of a group of enzymes that catalyze the insertion of an oxygen molecule into an organic substrate.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.