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  1. biochemical oxygen demand

    • IPA[ˌbīōˌkeməkəl ˈäksəjən diˌmand]

    美式

    • n.
      the amount of dissolved oxygen that must be present in water in order for microorganisms to decompose the organic matter in the water, used as a measure of the degree of pollution.
    • noun: biochemical oxygen demand, plural noun: biochemical oxygen demands