pastille UK /ˈpæst(ɪ)l/US /pæsˈtil/noun 5verb 1forms 3 noun5 •A flavoured candy or sweet, often round and somewhat flat in shape. •Any small, usually round and somewhat flat, granular piece of material; a tablet.Watercolors of professional quality come in small pastilles of dry pigment, in pans of semi-moist paint, or in tubes or bottles of liquid watercolor. — 2003 •A candy- or sweet-like lozenge, which, when sucked, releases substances that soothe a sore throat, and sometimes vapours to help unblock the nose or sinuses. •(historical) A small pellet containing aromatic substances, burned to diffuse a fragrance or to disinfect or fumigate.At the end he felt faint and sick, and having lit some Algerian pastilles in a pierced copper brazier, he bathed his hands and forehead with a cool musk-scented vinegar. — 1891 •(historical) A medicinal pill, originally made of compressed herbs. verb1 •To make into a pastille. formspastilled · pastilling · pastilles