The definition of archaebacteria are primitive bacteria microorganisms that have one cell and live in environments that are severe, such as those that are extremely salty or hot.
An example of archaebacteria are methanogens.
plural nounsing. -·rium or -·ria
- (biology) plural form of archaebacterium
From Ancient Greek ἀρχαῖος (arkhaios, “ancient”) + bacteria, from βακτηρία (baktēria, “rod, staff”).