noun Biology.
oriented growth in response to water.

1880–85; hydro-1 + -tropism

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World English Dictionary
hydrotropism (haɪˈdrɒtrəˌpɪzəm)
the directional growth of plants in response to the stimulus of water

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American Heritage
Medical Dictionary

hydrotropism hy·drot·ro·pism (hī-drŏt'rə-pĭz'əm)
Growth or movement in a sessile organism toward or away from water.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
hydrotropism   (hī-drŏt'rə-pĭz'əm)  Pronunciation Key 
The growth or movement of a fixed organism, especially a plant, or a part of an organism toward or away from water. Roots often display hydrotropism in growing towards a water source.

hydrotropic adjective (hī'drə-trō'pĭk, hī'drə-trŏp'ĭk)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The scientists believe that a mechanism called hydrotropism can actually override geotropism.
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