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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.
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Origin of phototaxis

First recorded in 1900–05; photo- + -taxis
Related formspho·to·tac·tic [foh-tuh-tak-tik] /ˌfoʊ təˈtæk tɪk/, adjectivepho·to·tac·ti·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for phototactic

phototaxis

phototaxy

noun
  1. the movement of an entire organism in response to light
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Derived Formsphototactic (ˌfəʊtəʊˈtæktɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

phototactic in Medicine

phototaxis

(fō′tō-tăksĭs)
n.
  1. The movement of an organism or cell toward or away from a source of light.
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Related formspho′to•tactic (-tăktĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.