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heliotropism

[hee-lee-o-truh-piz-uh m, hee-lee-uh-troh-piz-uh m] /ˌhi liˈɒ trəˌpɪz əm, ˌhi li əˈtroʊ pɪz əm/
noun
1.
heliotropic tendency or growth.
Origin
1850-1855
1850-55; helio- + -tropism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for heliotropism

heliotropism

/ˌhiːlɪˈɒtrəˌpɪzəm/
noun
1.
the growth of plants or plant parts (esp flowers) in response to the stimulus of sunlight, so that they turn to face the sun
Derived Forms
heliotropic (ˌhiːlɪəʊˈtrɒpɪk) adjective
heliotropically, adverb
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
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Word Origin and History for heliotropism
n.

1854, from heliotrope + -ism.

Online Etymology Dictionary, © 2010 Douglas Harper
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heliotropism in Science
heliotropism
  (hē'lē-ŏt'rə-pĭz'əm)   
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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