Donovan body

noun

Don·​o·​van body ˈdän-ə-vən-  ˈdən- 

: an encapsulated gram-negative bacterium of the genus Klebsiella (K. granulomatis synonym Calymmatobacterium granulomatis) that is the causative agent of granuloma inguinale and is characterized by one or two opposite polar chromatin masses compare leishman-donovan body