Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Growth or movement in a sessile organism toward or away from water, as of the roots of a plant.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The movement of a plant (or other organism) either towards or away from water

from the GNU version of the Collaborative International Dictionary of English

  • n. A tendency towards moisture.
  • n. In a broader sense, any curvature or turning induced in certain growing plant organs under the influence of moisture.

from The Century Dictionary and Cyclopedia

  • n. A state induced in a growing organ by the influence of moisture, in which under certain conditions it turns toward the moisture, and under other little understood conditions it turns away from the moisture.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

hydro- +‎ tropism

Examples

  • This is in response to positive hydrotropism ( "water-turning" G).

    The Human Brain

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