BOD biological oxygen definition
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)âcalled also biological oxygen demand, oxygen demand. Britannica.com: Encyclopedia article about biochemical oxygen demand.noun biochemical oxygen deÂ·mand \-di-Ëmand\. : the oxygen used in meeting the metabolic needs of aerobic microorganisms in water rich in organic matter (as water polluted with sewage)âcalled 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-Ëmand\.