{ n. Formerly also }. [ Chemical + Gr. &unr_; arrangement, fr. &unr_; to arrange. ] (Biol.) The sensitiveness exhibited by small free-swimming organisms, as bacteria, zoospores 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. [ Webster 1913 Suppl. ]
{ or }, a. [ Gr. shmeiwtiko`s, fr. shmei^on a mark, a sign. ] 1. Relating to signs or indications; pertaining to the language of signs, or to language generally as indicating thought. [ 1913 Webster ]
2. (Med.) Of or pertaining to the signs or symptoms of diseases. [ 1913 Webster ]