The Collaborative International Dictionary
Aerotaxis
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.
Wiktionary
aerotaxis
n. (context biology English) movement of an organism either towards or away from a region of higher oxygen content.