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[ noun ] layer of sand or gravel used to expose sewage effluent to air and the action of microorganisms

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bacteria_order bacteriemia bacteriacide bacteriaemia bacterial bacterize bacterise bacteremia bacterioid bacteria_genus bacterially bactericide bacteriological bacteria_family bactericidal bacterioidal bastardized bastardised bacterium bacteriolytic bacteriologic bacteriophage bacteriolysis bacteroid Bastarache bacteriologist bacteroidal bastardise bastardize Bacteroidaceae bacterial_toxin bacteriostat Bacteroides bacteriology

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