phytohormone
/ˌfaɪtoʊˈhɔːrmoʊn/
noun
- A chemical substance produced by plants that regulates growth, development, and responses to the environment.
- Auxin is a well-known phytohormone that helps plants grow toward light.
- When a plant is stressed by drought, it releases a phytohormone called abscisic acid to close its leaf pores.
- Gardeners sometimes use synthetic phytohormones to encourage rooting in cuttings.
Synonyms