Definition of pastilles:
(n) :
An often round and somewhat flat flavoured candy or sweet.
(n) :
(pharmacy) 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.
(n) :
Any small, usually round and somewhat flat, granular piece of material; a tablet.
(n) :
(specifically, historical) A small pellet containing aromatic substances, burned to diffuse a fragrance or to disinfect or fumigate.
(n) :
(pharmacy) (historical) A medicinal pill, originally made of compressed herbs.
(v) :
(transitive) To make into a pastille.