helio-tropically

heliotropic

[hee-lee-uh-trop-ik, -troh-pik]
adjective Biology.
turning or growing toward the light.

Origin:
1870–75; helio- + -tropic

heliotropically, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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