hydrotropism

• POS: Noun
• HYPHEN: hy=drot=ro=pism

CIDE DICTIONARY

hydrotropism, n. 

•  A tendency towards moisture.  [1913 Webster]
•  In a broader sense, any curvature or turning induced in certain growing plant organs under the influence of moisture.

  " 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."  [Webster 1913 Suppl.]

OXFORD DICTIONARY

hydrotropism, adj. a tendency of plant roots etc. to turn to or from moisture.