1. tropism

noun. an involuntary orienting response; positive or negative reaction to a stimulus source.


  • phototropism
  • meteortropism
  • reaction
  • trophotropism
  • response
  • ergotropism
  • thermotropism
  • heliotropism
  • neurotropism

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Sentences with tropism

1. Noun, singular or mass
The tendency of a plant to grow in the direction of a stimulus is called a tropism.