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Saltbush scrub and cottonwood trees in Owens Valley, with Owens Salt Lake and the Inyo Range in the distance. The pinkish coloration of the water is caused by high concentrations of halophilic archaebacteria. Image taken in August 2006.

(genetic biology)

Grammar: noun
Definition: the former name for Archaea, one of the three Domains of Life
Example:
1. There are three major known groups of Archaebacteria: the methanogens, halophiles, and thermophiles.

2. Many books and articles still refer to them as "Archaebacteria", that term has been largely abandoned because they are quite different to bacteria.
Alternative Form: Archaea