'Heliotropism' definitions:
Definition of 'heliotropism'
From: WordNet
noun
An orienting response to the sun
Definition of 'Heliotropism'
From: 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]