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[hee-lee-uh-trop-ik, -troh-pik] /ˌhi li əˈtrɒp ɪk, -ˈtroʊ pɪk/
adjective, Biology.
turning or growing toward the light.
Origin of heliotropic
1870-75; helio- + -tropic
Related forms
heliotropically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for heliotropic
Historical Examples
  • Plant organs exhibit, as we have already seen, a heliotropic curvature under direct stimulation.

  • This heliotropic sensitiveness lasts only as long as they are not fed.

    Darwin and Modern Science A.C. Seward and Others
  • heliotropic reactions play a great rle in the preservation of individuals as well as of species.

  • This reflex process agrees in every point with the heliotropic effects of light on plant organs.

  • We must therefore conclude that the heliotropic curvature of the polyps is determined by a photochemical action of the light.

  • The eyes of this heliotropic machine consist of two lenses in whose focus is situated the retina consisting of selenium wire.

  • If the cotyledon be shaded and the light be permitted to fall on one side of the hypocotyl, no heliotropic curving takes place.

heliotropic in Science
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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