Koch's bacillus
noun
\ ˈkōks-
, ˈkäch-əz-
\
, ˈkäch-əz-
\
variants:
or Koch bacillus \ ˈkōk-
, ˈkäch-
\
, ˈkäch-
\
Medical Definition of Koch's bacillus
: a bacillus of the genus Mycobacterium (M. tuberculosis) that causes human tuberculosis