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.]