a["e]robic

from The Collaborative International Dictionary of English v.0.48

Aerobic \A`["e]r*o"bic\, a. (Biol.)
   Growing or thriving only in the presence of oxygen; also,
   pertaining to, or induced by, a["e]robies; as, a["e]robic
   fermentation. -- {A`["e]r*o"bic*al*ly}, adv.
   [Webster 1913 Suppl.]