IPA: /ˈpæstɪl/
KK: /ˈpæstɪl/
A small cone or mass made from a mixture of aromatic substances, used to create pleasant smells or for medicinal purposes.
She lit a pastil to fill the room with a soothing fragrance.
Pastil comes from the Old French word *pastille*, which means a small cake or lozenge, derived from the Latin *pasta*, meaning paste or dough. The word refers to a small, often medicinal, cake or tablet.
Think of a small 'cake' or 'lozenge' ('pastille') that is made from 'paste' ('pasta') — that's why a pastil is a small, often medicinal tablet.