Chemotaxis \Chem`o*tax"is\, n. Formerly also Chemiotaxis
\Chem`i*o*tax"is\ [Chemical + Gr. ? arrangement, fr. ? to
arrange.] (Biol.)
The sensitiveness exhibited by small free-swimming organisms,
as bacteria, zoospores of alg[ae], 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.
[Webster 1913 Suppl.] chemotherapeutic