[foh-to-truh-piz-uhm, foh-toh-troh-piz-uhm]
noun Botany.
phototropic tendency or growth.

1895–1900; photo- + -tropism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
phototropism (ˌfəʊtəʊˈtrəʊpɪzəm)
1.  the growth response of plant parts to the stimulus of light, producing a bending towards the light source
2.  the response of animals to light; phototaxis

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

phototropism pho·tot·ro·pism (fō-tŏt'rə-pĭz'əm)
Growth or movement of a sessile organism toward or away from a source of light.

pho'to·tro'pic (fō'tə-trō'pĭk, -trŏp'ĭk) 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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American Heritage
Science Dictionary
phototropism   (fō-tŏt'rə-pĭz'əm)  Pronunciation Key 
The growth or movement of a fixed organism toward or away from light. In plants, phototropism is a response to blue wavelengths of light and is caused by a redistribution of auxin from the illuminated side to the darker side of the shoot, resulting in quicker growth on the darker side and bending of the shoot toward the source of light. Certain sessile invertebrates also exhibit phototropism.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Plants may respond to light by growing toward it or away from it, a behavior known as phototropism.
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