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

First recorded in 1870–75; helio- + -tropic
Related formshe·li·o·trop·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for heliotropic

Historical Examples of heliotropic

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

    Darwin and Modern Science

    A.C. Seward and Others

  • 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.

  • Heliotropic reactions play a great rle in the preservation of individuals as well as of species.

heliotropic in Science


  1. 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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Related formsheliotropic adjective (hēl′lē-ə-trōpĭk, -trŏpĭk)
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.