Heliotropism

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Heliotropism \He`li*ot"ro*pism\, n. [Helio- + Gr. ? to turn.]
     (Bot.)
     The phenomenon of turning toward the light, seen in many
     leaves and flowers.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

  heliotropism
       n : an orienting response to the sun