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phototaxis

or pho·to·tax·y

[ foh-tuh-tak-sis ]
/ ˌfoʊ təˈtæk sɪs /
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noun Biology.
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

OTHER WORDS FROM phototaxis

pho·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. 2023

How to use phototaxis in a sentence

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

    The Wonders of Life|Ernst Haeckel

British Dictionary definitions for phototaxis

phototaxis

phototaxy

/ (ˌfəʊtəʊˈtæksɪs) /

noun
the movement of an entire organism in response to light

Derived forms of phototaxis

phototactic (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
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