Medical Definition of anaerobic
1a: living, active, or occurring in the absence of free oxygen <during heavy exercise anaerobic respiration occurs, pyruvic acid acts as a hydrogen acceptor, and lactic acid builds up in the tissues>b: of, relating to, or being activity in which the body incurs an oxygen debt <anaerobic sports> <an anaerobic workout>
2: relating to or induced by anaerobes
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