heliotropism

/HH IY1 L IY0 AH0 T R OW0 P IH0 Z AH0 M/
noun
  1. 1

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

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Source: https://en.wiktionary.org/wiki/heliotropism