bacteriologicalPronunciation: /bakˌtɪərɪəˈlɒdʒɪk(ə)l/Definition of bacteriological adjective relating to bacteriology or bacteria: bacteriological analysis relating to or denoting germ warfare: bacteriological weaponsDerivatives bacteriologic adjective bacteriologically adverb bacteriological in other Oxford dictionaries Definition of bacteriological in the US English dictionary