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Pho°totax"is (), Pho"totax°y ()}, n.[NL. phototaxis; photo- + Gr. an arranging.] (Biol.) The influence of light on the movements of low organisms, as various infusorians, the zospores of certain alg, etc.; also, the tendency to follow definite directions of motion or assume definite positions under such influence. If the migration is toward the source of light, it is termed positive phototaxis; if away from the light, negative phototaxis. -- Pho°totac"tic (), a. -- Pho°totac"tically, adv.
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