hydrotropism
noun
hy·drot·ro·pism hī-ˈdrä-trə-ˌpi-zəm 
: a tropism (as in plant roots) in which water or water vapor is the orienting factor
hydrotropic
ˌhī-drə-ˈtrō-pik
adjective -ˈträ-
Word History
Etymology
probably borrowed from German Hydrotropismus, from hydro- hydro- + -tropismus -tropism
First Known Use
circa 1882, in the meaning defined above
Medical Definition
hydrotropism
noun
hy·dro·tro·pism hī-ˈdrä-trə-ˌpiz-əm; ˌhī-drə-ˈtrō-ˌpiz-əm -ˈträ-
-ˈträ- : a tropism in which water or water vapor is the orienting factor