Thymol is a terpenoid, that is found in the essential oils of thyme (Thymus vulgaris), Oregano (Origanum vulgare) and related species and has the characteristic smell of thyme.

thymol structure

Thymol (C₁₀H₁₄O) is often used in synthetic aromas for products with a ‘Mediterranean flavour'. It is not or poorly soluble in water, but easily soluble in alcohol and oils.

Besides as flavour, thymol has also been used as a fungicide.