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[foh-tuh-tak-sis] /ˌfoʊ təˈtæk sɪs/

noun, Biology.
movement of an organism toward or away from a source of light.
the movement of an entire organism in response to light

phototaxis pho·to·tax·is (fō’tō-tāk’sĭs)
The movement of an organism or a cell toward or away from a source of light.
pho’to·tac’tic (-tāk’tĭk) adj.


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  • Phototherapeutics

    [foh-tuh-ther-uh-pyoo-tiks] /ˌfoʊ təˌθɛr əˈpyu tɪks/ noun, (used with a singular verb) 1. the branch of that deals with the curative use of light rays.

  • Phototherapy

    [foh-tuh-ther-uh-pee] /ˌfoʊ təˈθɛr ə pi/ noun 1. treatment of disease, especially of the skin, by means of light rays. 2. . /ˌfəʊtəʊˈθɛrəpɪ/ noun 1. (functioning as sing) the use of light in the treatment of disease phototherapy pho·to·ther·a·py (fō’tō-thěr’ə-pē) n. The treatment of a disorder, especially of the skin, by exposure to light, including ultraviolet […]

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