heliotropism
[hee-lee-o-truh-piz-uh m, hee-lee-uh-troh-piz-uh m]
- heliotropic tendency or growth.
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Origin of heliotropism
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for heliotropism
Historical Examples
The heliotropism of animals is identical with the heliotropism of plants.
Darwin and Modern ScienceA.C. Seward and Others
We have mentioned the newly hatched larv of the barnacle in connection with heliotropism.
The Organism as a WholeJacques Loeb
If it acts in a one-sided way, it causes the particular form of stimulation which we call phototaxis or heliotropism.
The Wonders of LifeErnst Haeckel
We notice also the reverse phenomenon, namely, that chemical changes produced in the animal destroy its heliotropism.
Darwin and Modern ScienceA.C. Seward and Others
These periodic motions are determined to a large extent, if not exclusively, by the heliotropism of these animals.
Darwin and Modern ScienceA.C. Seward and Others
heliotropism
- the growth of plants or plant parts (esp flowers) in response to the stimulus of sunlight, so that they turn to face the sun
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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
Word Origin and History for heliotropism
n.
1854, from heliotrope + -ism.
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Online Etymology Dictionary, © 2010 Douglas Harper
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.
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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.