Wordnet 3.0
ADJECTIVE (2)
1. living or active in the absence of free oxygen;
- Example: "anaerobic bacteria"
[syn: anaerobic, anaerobiotic]
2. not aerobic;
- Example: "isometric exercises are anaerobic"
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]

