thermotropism
noun
ther·mot·ro·pism (ˌ)thər-ˈmä-trə-ˌpi-zəm 
: a tropism in which a temperature gradient determines the orientation
Word History
Etymology
thermo- + -tropism, probably after German Thermotropismus
First Known Use
circa 1890, in the meaning defined above
Medical Definition
thermotropism
noun
ther·mot·ro·pism (ˌ)thər-ˈmä-trə-ˌpiz-əm
: a tropism in which a temperature gradient determines the orientation