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Medical Definition of Methanosarcina
1. A genus of anaerobic, irregular spheroid-shaped methanosarcinales whose organisms are nonmotile. Endospores are not formed. These archaea derive energy via formation of methane from acetate, methanol, mono-, di-, and trimethylamine, and possibly, carbon monoxide. Organisms are isolated from freshwater and marine environments. (12 Dec 1998)