archaea
[ ahr-kee-uh ]
/ ˈɑr ki ə /
plural noun, singular ar·chae·on [ahr-kee-on]. /ˈɑr kiˌɒn/. Microbiology.
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 classified by many biologists as constituting the domain Archaea.
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Origin of archaea
First recorded in 1985–90; from New Latin, from Greek archaîa, neuter plural of archaîos “ancient”; see origin at archaeo-
Words nearby archaea
Arcesilaus, Arcesius, arcform, arc furnace, arch, archaea, archaean, archaebacteria, archaebacterium, archaeo-, archaeoastronomy
Definition for archaea (2 of 2)
Archaea
[ ahr-kee-uh ]
/ ˈɑr ki ə /
noun (used with a singular or plural verb)Microbiology.
(in the three-domain system of classification) the taxonomic domain comprising the archaea.
See also domain (def. 6).
Origin of Archaea
From New Latin; see origin at archaea
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021