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tropism

[troh-piz-uh m] /ˈtroʊ pɪz əm/
noun, Biology
1.
an orientation of an organism to an external stimulus, as light, especially by growth rather than by movement.
Origin of tropism
1895-1900
1895-1900; independent use of -tropism
Related forms
tropismatic
[troh-piz-mat-ik] /ˌtroʊ pɪzˈmæt ɪk/ (Show IPA),
adjective
tropistic
[troh-pis-tik] /troʊˈpɪs tɪk/ (Show IPA),
adjective

-tropism

1.
variant of -tropy.
Origin
see -tropy, -ism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for tropism
British Dictionary definitions for tropism

tropism

/ˈtrəʊpɪzəm/
noun
1.
the response of an organism, esp a plant, to an external stimulus by growth in a direction determined by the stimulus
Derived Forms
tropismatic, adjective
tropistic (trəʊˈpɪstɪk) adjective
Word Origin
from Greek tropos a turn

-tropism

combining form
1.
indicating a tendency to turn or develop in response to a certain stimulus: phototropism
Word Origin
from Greek tropos a turn
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for tropism
n.

1899, "tendency of an animal or plant to turn or move in response to a stimulus," abstracted from geotropism, ultimately from Greek tropos (see trope).

Online Etymology Dictionary, © 2010 Douglas Harper
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tropism in Medicine

tropism tro·pism (trō'pĭz'əm)
n.
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.

-tropism suff.
Tropism: stereotropism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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tropism in Science
tropism
  (trō'pĭz'əm)   
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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11
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