heliotropism

heliotropism

[hee-lee-o-truh-piz-uhm, hee-lee-uh-troh-piz-uhm]
noun
heliotropic tendency or growth.

Origin:
1850–55; helio- + -tropism

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Collins
World English Dictionary
heliotropism (ˌhiːlɪˈɒtrəˌpɪzəm)
 
n
the growth of plants or plant parts (esp flowers) in response to the stimulus of sunlight, so that they turn to face the sun
 
heliotropic
 
adj
 
helio'tropically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
heliotropism   (hē'lē-ŏt'rə-pĭz'əm)  Pronunciation Key 
The growth or movement of a fixed organism, especially a plant, toward or away from sunlight. Heliotropism can be easily seen in sunflowers, which slowly turn their large flowers so that they continually face the sun.

heliotropic adjective (hēl'lē-ə-trō'pĭk, -trŏp'ĭk)
The American Heritage® Science Dictionary
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