phototropism

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

Origin:
1895–1900; photo- + -tropism

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Collins
World English Dictionary
phototropism (ˌfəʊtəʊˈtrəʊpɪzəm)
 
n
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
 
photo'tropic
 
adj

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American Heritage
Medical Dictionary

phototropism pho·tot·ro·pism (fō-tŏt'rə-pĭz'əm)
n.
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.
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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.
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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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