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From: Webster's Revised Unabridged Dictionary (1913)

 Hy·drot·ro·pism n.
 1. Bot. A tendency towards moisture.
 2. 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.
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