Any relatively large bacterium; specifically any of various rod-shaped microorganisms of uncertain classification that are associated with inflammation of the proventriculus in birds.
Origin
Late 19th century.
Definition of megabacterium in US English:
megabacterium
nounˌmɛɡəbakˈtɪərɪəm
Any relatively large bacterium; specifically any of various rod-shaped microorganisms of uncertain classification that are associated with inflammation of the proventriculus in birds.