heliotropism

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English[edit]

Etymology[edit]

helio- +‎ tropism

Noun[edit]

heliotropism (uncountable)

  1. The property of some plants of turning under the influence of light; either positively (towards the light) or negatively (away from the light)
    • 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.

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