Category:Phototaxis

Pho`to*tax"is, pho"to*tax`y, n. [nl. phototaxis; photo- + gr. an Arranging.] (biol.)

Defn: the influence of light on the movements of low organisms, as Various infusorians, the zoöspores of certain algæ, 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.