{Chem`o*tax"is (?), n. Formerly also Chem`i*o*tax"is}. [Chemical + Gr. &?; arrangement, fr. &?; to arrange.] (Biol.) The sensitiveness exhibited by small free-swimming organisms, as bacteria, zoöspores of algæ, etc., to chemical substances held in solution. They may be attracted (positive chemotaxis) or repelled (negative chemotaxis). -- Chem`o*tac"tic (#), a. -- Chem`o*tac"tic*al*ly, adv.

{Chem`o*tax"is (?), n. Formerly also Chem`i*o*tax"is}. [Chemical + Gr. &?; arrangement, fr. &?; to arrange.] (Biol.) The sensitiveness exhibited by small free-swimming organisms, as bacteria, zoöspores of algæ, etc., to chemical substances held in solution. They may be attracted (positive chemotaxis) or repelled (negative chemotaxis). -- Chem`o*tac"tic (#), a. -- Chem`o*tac"tic*al*ly, adv.

• (biology) (biochemistry) the movement of a cell or an organism in response to a chemical stimulant