noun Biology.
an orientation of an organism to an external stimulus, as light, especially by growth rather than by movement.

1895–1900; independent use of -tropism

tropismatic [troh-piz-mat-ik] , adjective
tropistic [troh-pis-tik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tropism (ˈtrəʊpɪzəm)
the response of an organism, esp a plant, to an external stimulus by growth in a direction determined by the stimulus
[from Greek tropos a turn]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1899, "tendency of an animal or plant to turn or move in response to a stimulus," abstracted from geotropism, ult. from Gk. tropos (see trope).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

tropism tro·pism (trō'pĭz'əm)
The turning or bending movement of a living organism or part toward or away from an external stimulus, such as light, heat, or gravity.

tro'pic, tro·pis'tic adj.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
tropism  [%PREMIUM_LINK%]     (trō'pĭz'əm)  Pronunciation Key 
The growth or movement of a living organism or anatomical structure toward or away from an external stimulus, such as light, heat, or gravity. See also geotropism, hydrotropism, phototropism.

tropistic adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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