Definition of archaea
Origin of archaea
New Latin, from Greek archaios
First Known Use: 1990
Medical Definition of archaea
1 capitalized : a domain of primitive single-celled prokaryotic microorganisms including methane-producing forms and others that thrive in extremely salty or hot, often acidic environments <They are largely Archaea, a domain of life first identified 20 years ago …—Charles W. Petit and Laura Tangley, U.S. News & World Report, 8 Nov. 1999>
2: microorganisms of the domain Archaea <Many of the archaea are thermophilic.—David W. Wolfe, Wilson Quarterly, Spring 2001>
Learn More about archaea
Britannica.com: Encyclopedia article about "archaea"
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