coumarin /ˈkuːməɹɪn/ noun1 •The bicyclic aromatic compound 1,2-benzopyrone or any of its derivatives.Coumarin's spicy, balsamic, and sweet vanilla scent is valued by perfume and flavor industries, but it may also add a hint of tobacco to a perfume blend or enhance lavender in a scent. — 2022 formscoumarins