Definition of archaebacteria in English:


plural noun

  • another term for archaea
    • ‘These ‘bugs, ‘actually archaebacteria, thrive in intense heat and pressure deep underground, without any light - that is, in a truly alien environment within planet earth.’’
    • ‘The most startling (and, for some people, unbelievable) such event was the origin of the eukaryotes by the fusion of an archaebacterium with some eubacteria.’
    • ‘What's more, these origin-of-life researchers suspect that the two major groups of bacteria, known as archaebacteria and eubacteria, originated on two separate occasions about 3.8 billion years ago.’
    • ‘These sequences included proteins from a diverse range of organisms, ranging from eubacteria and archaebacteria to algae, fungi, and plants.’
    • ‘They conjecture that an evolutionary quantum leap happened after an archaebacterium swallowed a eubacterium.’


1970s: modern Latin (plural), from Greek arkhaios ‘primitive’.