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  1. Dictionary
    Bi·o·chem·i·cal ox·y·gen de·mand
    /ˌbīōˌkeməkəl ˈäksəjən diˌmand/

    noun

    • 1. 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.

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