English edit

 
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Etymology edit

helio- +‎ -tropism

Noun edit

heliotropism (countable and uncountable, plural heliotropisms)

  1. The property of some plants of turning under the influence of light; either positively (towards the light) or negatively (away from the light)
    • 1880 November 6, Charles Darwin, Francis Darwin, chapter XII, in The Power of Movement in Plants[1], page 555:
      As soon as the faintest ray of light reaches a seedling, heliotropism will guide it through any crack in the soil, or through an entangled mass of overlying vegetation; []
    • 2012, Staff (University of Wisconsin-Madison), Sunflowers inspire more efficient solar power system, R&D Magazine, online:
      A field of young sunflowers will slowly rotate from east to west during the course of a sunny day, each leaf seeking out as much sunlight as possible as the sun moves across the sky through an adaptation called heliotropism.

Derived terms edit

Related terms edit

Translations edit

Romanian edit

Etymology edit

Borrowed from French héliotropisme.

Noun edit

heliotropism n (uncountable)

  1. heliotropism

Declension edit