Anaerobia

An*a`ër*o"bi*a, An*a"ër*obes, n. pl. [NL. anaerobia; an-not + aëro- + Gr. life.] (Bacteriol.)

Defn: Anaërobic bacteria. They are called facultative anaërobia when able to live either in the presence or absence of free oxygen; obligate, or obligatory, anaërobia when they thrive only in its absence.