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phototactic |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Phototaxis \Pho`to*tax"is\, Phototaxy \Pho"to*tax`y\, n. [NL. phototaxis; photo- + Gr ? an arranging.] (Biol.) The influence of light on the movements of low organisms, as various infusorians, the zo["o]spores 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 {positive phototaxis}; if away from the light, {negative phototaxis}. -- {Pho`to*tac"tic}, a. -- {Pho`to*tac"tic*al*ly}, adv
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