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phototaxis

or pho·to·tax·y

[ foh-tuh-tak-sis ]

noun

, Biology.
  1. movement of an organism toward or away from a source of light.

phototaxis

/ ˌfəʊtəʊˈtæksɪs; ˌfəʊtəʊˈtæktɪk /

noun

  1. the movement of an entire organism in response to light

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Derived Forms

  • phototactic, adjective

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Other Words From

  • pho·to·tac·tic [foh-t, uh, -, tak, -tik], adjective
  • photo·tacti·cal·ly adverb

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Word History and Origins

Origin of phototaxis1

First recorded in 1900–05; photo- + -taxis

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Example Sentences

If it acts in a one-sided way, it causes the particular form of stimulation which we call phototaxis or heliotropism.

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