Definitions

1. noun

A plant of the genus Chrysanthemum, especially the Chrysanthemum segetum, with yellow flowers that turn yellow and then red as they fade.

“The turnsole plants have been used for centuries to make natural dyes.”

2. verb

To change color, especially to yellow and then red, as the flowers of the turnsole plant do after fading.

“The sunflowers turnsole in the autumn, displaying their vibrant colors.”