hydro tactic

hydrotaxis

[hahy-druh-tak-sis]
noun Biology.
oriented movement toward or away from water.

Origin:
1895–1900; hydro-1 + -taxis

hydrotactic [hahy-druh-tak-tik] , adjective
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World English Dictionary
hydrotaxis (ˌhaɪdrəʊˈtæksɪs)
 
n
the directional movement of an organism or cell in response to the stimulus of water
 
hydro'tactic
 
adj

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

hydrotaxis hy·dro·tax·is (hī'drə-tāk'sĭs)
n.
movement of a cell or an organism in response to moisture.

The American Heritage® Stedman's Medical Dictionary
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