superoxide dismutase

Medical Dictionary

superoxide dismutase n.
An enzyme that catalyzes the decomposition of a superoxide into hydrogen peroxide and oxygen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
superoxide dismutase

noun
an enzyme that catalyzes the conversion of superoxide into hydrogen peroxide and oxygen; "oxygen free radicals are normally removed in our bodies by the superoxide dismutase enzymes" 
WordNet® 3.0, © 2006 by Princeton University.
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