Wordnet 3.0
NOUN (1)
1. 
 an enzyme that catalyzes the conversion of superoxide into hydrogen peroxide and oxygen; 
- Example: "oxygen free radicals are normally removed in our bodies by the superoxide dismutase enzymes"[syn: superoxide dismutase, SOD]
WordNet (r) 3.0 (2006):
superoxide dismutase
    n 1: 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" [syn: superoxide dismutase, SOD]