Definitions

1. noun

A yellow pigment or colour derived from a plant, originally from the Atropa belladonna.

“The artist mixed a combination of tropaeolin and umber to create a unique shade of brown.”

2. noun

A yellow pigment or dye obtained from certain plants, especially a plant of the genus Heliotropium.

“Tropaeolin is a naturally occurring dye found in certain species of Heliotropium.”