The Collaborative International Dictionary
negative hydrotropism
Hydrotropism \Hy*drot"ro*pism\, n.
(Bot.) A tendency towards moisture.
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(Bot.) In a broader sense, any curvature or turning induced in certain growing plant organs under the influence of moisture.
Note: When the movement is toward the moisture, as is the case in most roots, the phenomenon is called positive hydrotropism; when away from the moisture, as in the case of hyphae of certain fungi, negative hydrotropism.