noun Biology.
movement of an organism toward or away from a source of light.
Also, phototaxy.

1900–05; photo- + -taxis

phototactic [foh-tuh-tak-tik] , adjective
phototactically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
phototaxis or phototaxy (ˌfəʊtəʊˈtæksɪs)
the movement of an entire organism in response to light
phototaxy or phototaxy
phototactic or phototaxy

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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