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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Chem·o·tax·is n. Formerly also Chem·i·o·tax·is.  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.
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From: WordNet (r) 2.0

 negative chemotaxis
      n : movement away from a chemical stimulus