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[mass noun] The turning or bending of a plant or other organism in response to a touch stimulus.
- ‘This paper focuses on the recent advances in four of the best-understood tropic responses and how each affects plant growth and development: phototropism, gravitropism, thigmotropism and hydrotropism.’
- ‘Negative thigmotropism is movement away from an object, such as a root away from a rock in the soil.’
- ‘More recently, however, the Arabidopsis root movements were reinterpreted as the combined effect of essentially three processes, circumnuation, gravitropism and negative thigmotropism.’
- ‘One of the most common examples of thigmotropism is seen in tendrils, which wrap around any object with which they come in contact.’
- ‘At first, mushroom primordia grow perpendicularly away from the surface from which they arise, independently of the direction of light or gravity, a response that may be some kind of negative thigmotropism or negative hydrotropism.’
Early 20th century: from Greek thigma touch + tropism.
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