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'Anaerobic' is a technical word which literally means ''without air'' (where "air" is generally used to mean oxygen), as opposed to aerobic. In wastewater treatment the absence of oxygen is indicated as ''anoxic''; and ''anaerobic'' is used to indicate the absence of any electron acceptor (nitrate, sulfate or oxygen). An 'anaerobic' adhesive is a bonding agent that does not cure in the presence of air.
'Anaerobic' may refer to:

★ Anaerobic clarigester, is a form of anaerobic digester

★ Anaerobic contact process, is a type of anaerobic digester

★ Anaerobic digestion, (AD) is the harnessed and contained, naturally occurring process of anaerobic decomposition

★ Anaerobic exercise, a form of exercise

★ Anaerobic filter

★ Anaerobic glycolysis, the conversion from sugar to alcohol using yeast - see Fermentation (biochemistry)

★ Anaerobic lagoon, used to dispose of animal waste, particularly that of cows and pigs

★ Anaerobic organism, any organism that does not require oxygen for growth

★ Anaerobic respiration, oxidation of molecules in the absence of oxygen monoxide

★ Anaerobic ammonium oxidation, anammox, the microbial process combining ammonium and nitrite.