heliotropism

 
Pronunciation: /ˌhiːlɪə(ʊ)ˈtrəʊpɪz(ə)m/

noun

[mass noun] Botany
  • the directional growth of a plant in response to sunlight. Compare with phototropism.
  • Zoology the tendency of an animal to move towards light.

Derivatives

heliotropic

Pronunciation: /ˌhiːlɪəˈtrɒpɪk/
adjective