From The Collaborative International Dictionary of English v.0.48 [gcide]:
Phototaxis \Pho'to*tax"is\, Phototaxy \Pho"to*tax'y\, noun [NL. phototaxis; photo- + Gr. ? an arranging.] (Biol.) The influence of light on the movements of low organisms, as various infusorians, the zoospores of certain alg[ae], 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
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