Definition of heliotropism in English:

heliotropism

noun

Botany
  • 1The directional growth of a plant in response to sunlight.

    Compare with phototropism
    • ‘The heliotropism itself is an adaptation for survival, the plant maximizing sunlight.’
    • ‘All legume plants do this, so be sure to watch your peas and beans for signs of heliotropism.’
    • ‘The adaptive significance of solar tracking in snow buttercups is mediated through the impact of flower heliotropism on paternal and maternal floral environments.’
    1. 1.1Zoology
      The tendency of an animal to move toward light.

Pronunciation:

heliotropism

/ˌhēlēəˈtrōpizəm/