Medical Definition of propionibacterium
1 capitalized : a genus (the type of the family Propionibacteriaceae) of gram-positive nonmotile usually anaerobic bacteria that form propionic acid by fermenting lactic acid, carbohydrates, and polyalcohols and that include forms found especially on human skin and in dairy products
2plural propionibacteria \-ē-ə\play : any bacterium of the genus Propionibacterium
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