Webster's English Dictionary

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mycobacterium

my.co.bac.te.ri.um \.mi--ko--(.)bak-'tir-e--*m\ n [NL, genus name, fr. myc- 
   + Bacterium] : any of a genus (Mycobacterium) of nonmotile aerobic bacteria 
   that  are difficult to stain and include numerous saprophytes and the 
   organisms causing tuberculosis and leprosy