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mi·cro·bi·al mī-'krō-bē-əl adj of, relating to, caused by, or being microbes <\microbial infection> <\microbial agents>
mi·cro·bi·al·ly -ē adv
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mi·cro·bi·al (mi-kroґbe-əl) of or pertaining to or caused by microbes.Medical dictionary. 2011.