anaerobic

from WordNet (r) 3.0 (2006)

anaerobic
    adj 1: living or active in the absence of free oxygen;
           "anaerobic bacteria" [syn: {anaerobic}, {anaerobiotic}]
           [ant: {aerobic}, {aerophilic}, {aerophilous}]
    2: not aerobic; "isometric exercises are anaerobic" [ant:
       {aerobic}]

from The Collaborative International Dictionary of English v.0.48

Anaerobic \An*a`["e]*rob"ic\, a. [Pref. an-not + a["e]robic.]
   1. (Biol.) Not requiring air or oxygen for life; -- applied
      especially to those microbes to which free oxygen is
      unnecessary; ana["e]robiotic; -- opposed to {a["e]robic}.
      [Webster 1913 Suppl.]

   2. (Biol.) Relating to, or like, ana["e]robies;
      ana["e]robiotic.
      [1913 Webster]