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COD or Chemical Oxygen Demand definition. Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as Ammonia and nitrite.
Medical Definition of BIOCHEMICAL OXYGEN DEMAND. : the oxygen used in meeting the metabolic needs of aerobic microorganisms in water rich in organic matter (as water polluted with sewage)âcalled also biological oxygen demand, oxygen demand. Britannica.com: Encyclopedia article about biochemical oxygen demand.noun biochemical oxygen deÂ·mand \-di-Ëmand\. : the oxygen used in meeting the metabolic needs of aerobic microorganisms in water rich in organic matter (as water polluted with sewage)âcalled also biological oxygen demand, oxygen demand.efinition of BIOCHEMICAL OXYGEN DEMAND. : the oxygen used in meeting the metabolic needs of aerobic microorganisms in water rich in organic matter (as water polluted with sewage). ADVERTISEMENT. noun biochemical oxygen deÂ·mand \-di-Ëmand\.