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a group of microorganisms, including the methanogens and certain halophiles and thermoacidophiles, that have RNA sequences, coenzymes, and a cell wall composition that are different from all other organisms: considered to be an ancient form of life that evolved separately from the bacteria and blue-green algae and sometimes classified as a kingdom.
plural noun
(formerly) a group of microorganisms now regarded as members of the Archaea See archaean

plural of archaebacterium (1977), from archaeo- + bacterium (see bacteria).
Plural archaebacteria
See archaeon.


Read Also:

  • Archaeo-

    a combining form meaning “ancient,” used in the formation of compound words: archaeopteryx; archaeology. combining form indicating ancient or primitive time or condition: archaeology, archaeopteryx of, involving, or denoting the study of remains from archaeological sites: archaeozoology before vowels archae-, word-forming element meaning “ancient, olden, primitive, primeval, from the beginning,” from Latinized form of Greek […]

  • Archaeoastronomy

    the branch of archaeology that deals with the apparent use by prehistoric civilizations of astronomical techniques to establish the seasons or the cycle of the year, especially as evidenced in the construction of megaliths and other ritual structures. noun the scientific study of the beliefs and practices concerning astronomy that existed in ancient and prehistoric […]

  • Archaeobotany

    noun the analysis and interpretation of plant remains found at archaeological sites

  • Archaeocyathid

    one of the marine invertebrates of the extinct phylum Archaeocyatha, widely distributed during the Cambrian Period, having a limy, typically conical or cylindrical skeleton composed of sievelike inner and outer walls.

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