noun Biology.
oriented growth of an organism in response to mechanical contact, as a plant tendril coiling around a string support.

1895–1900; < Greek thígm(a) touch + -o- + -tropism

thigmotropic [thig-muh-trop-ik, -troh-pik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thigmotropism (ˌθɪɡməʊˈtrəʊpɪzəm)
haptotropism, Also called: stereotropism the directional growth of a plant, in response to the stimulus of direct contact
[C19: from Greek thigma touch + -tropism]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

thigmotropism thig·mot·ro·pism (thĭg-mŏt'rə-pĭz'əm)
The turning or bending response of an organism or part of an organism upon direct contact with a solid surface or object. Also called stereotropism.

thig'mo·trop'ic (thĭg'mə-trŏp'ĭk, -trō'pĭk)
The American Heritage® Stedman's Medical Dictionary
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