from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The tendency of plants or other organisms to bend toward or away from heat.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Thermotropic movement of a plant or plant part in response to changes in temperature.

from the GNU version of the Collaborative International Dictionary of English

  • n. The phenomenon of turning towards a source of warmth, seen in the growing parts of some plants.

from The Century Dictionary and Cyclopedia

  • n. In biology, the bending or growing of organisms in relation to heat.
  • n. In botany, the phenomenon of curvature produced in a growing plant-organ by changes of temperature. Organs which curve toward the source of heat are called positively thermotropic, and those which curve away from the source of heat, negatively thermotropic.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an orienting response to warmth


Sorry, no etymologies found.


  • Thus it was that the interpretations of J. Loeb (Die Tropismen, 1913) on the basis of experiments done with lower animals, estab - lished the neologist ideas of “phototropism” (orien - tation or displacement reaction in the direction of light), and of “thermotropism” (reaction directed to - wards a source of heat), to explain animal and perhaps also human behavior.

    Dictionary of the History of Ideas


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