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CIDE DICTIONARY
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phototaxy

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pho=to=tax=y

CIDE DICTIONARY

phototaxyn. [NL. phototaxis; photo- + Gr. an arranging.].
     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.  [Webster 1913 Suppl.]
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