eubacteria

Concise Oxford English Dictionary © 2008 Oxford University Press:
eubacteria /ˌjuːbakˈtɪərɪə/

▶plural noun (sing. eubacterium) Biology a large group of bacteria with simple cells and rigid cell walls, comprising the ‘true’ bacteria and cyanobacteria as distinct from archaea.

– derivatives
eubacterial adjective.

– origin 1930s: from mod. L. Eubacterium (genus name), from eu- (in sense ‘normal’) + bacterium.