archaebacteria

[ad_1] plural noun, singular ar·chae·bac·te·ri·um [ahr-kee-bak-teer-ee-uh m] /ˌɑr ki bækˈtɪər i əm/.

1. 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.

pl n

1. (formerly) a group of microorganisms now regarded as members of the ArchaeaSee archaean

n.

plural of archaebacterium (1977), from archaeo- + bacterium (see bacteria).

Plural archaebacteria

1. A former name for archaeon.

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