GNU Collaborative International Dictionary of English

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1.       
   { ‖Anaërobia , Anaerobes, Anaërobes  }, n. pl. [NL. anaerobia; an-not + aëro- + Gr. life.] (Bacteriol.) Anaërobic bacteria. They are called facultative anaërobes when able to live either in the presence or absence of free oxygen; obligate anaërobes, or obligatory anaërobes, when they thrive only in its absence.
   Webster 1913 Suppl.