propionibacterium

noun

pro·​pi·​oni·​bac·​te·​ri·​um ˌprō-pē-ˌän-ə-bak-ˈtir-ē-əm 

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

2

plural propionibacteria -ē-ə  : any bacterium of the genus Propionibacterium