The Collaborative International Dictionary of English v.0.48:

Aerotaxis \A"["e]r*o*tax`is\, n. [NL. See A["e]ro-; Taxis.]
   (Bacteriology)
   The positive or negative stimulus exerted by oxygen on
   a["e]robic and ana["e]robic bacteria. -- A`["e]r*o*tac"tic,
   a.
   [Webster 1913 Suppl.]