archaebacteria
Syllabification: (ar·chae·bac·te·ri·a)
Pronunciation: /ˌärkēˌbakˈti(ə)rēə/
Definition of archaebacteria
noun ( singular archaebacterium /-ˈti(ə)rēəm/)
Biology- microorganisms that are similar to bacteria in size and simplicity of structure but radically different in molecular organization. They are now believed to constitute an ancient intermediate group between the bacteria and eukaryotes. Also called archaea.
Origin:
modern Latin (plural), from Greek arkhaios 'primitive'