Dictionary

biochemical oxygen demand

noun

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)
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First Known Use of BIOCHEMICAL OXYGEN DEMAND

circa 1927
Medical Dictionary

biochemical oxygen demand

noun biochemical oxygen de·mand \-di-ˌmand\

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)—called also biological oxygen demand, oxygen demand

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