An organisms growth or movement in the direction of oxygen. In botany: a plant root's growth away from the natural direction due to the action of oxygen or other gases. ... (09 Oct 1997) ... 
aerotropism, aerotropic 1. Movement of an organism toward (positive aerotropism) or away from (negative aerotropism) a supply of air. 2. The growth or movement of an organism toward an air supply; such as, an air bubble in a bacterial culture chamber.
growth or movement in the direction of a supply of air or oxygen.