Chemotaxis

{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.