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heliotaxis

American  
[hee-lee-oh-tak-sis] / ˌhi li oʊˈtæk sɪs /

noun

Biology.

  1. movement of an organism toward or away from sunlight.

heliotaxis British  
/ ˌhiːlɪəʊˈtæksɪs, ˌhiːlɪəʊˈtæktɪk /

noun

  1. movement of an entire organism in response to the stimulus of sunlight

"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

Other Word Forms

  • heliotactic adjective

Etymology

Origin of heliotaxis

First recorded in 1895–1900; helio- + -taxis

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.