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chemotaxis (n.)

"disposition of microscopic organisms to move towards or away from certain chemicals," 1891, coined in German, 1888, by German botanist Wilhelm Pfeffer from chemo- + Greek taxis "arrangement" (see tactics).

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Definitions of chemotaxis from WordNet

chemotaxis (n.)
movement by a cell or organism in reaction to a chemical stimulus;
From wordnet.princeton.edu