Definition of pastille

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pas·tille    (p-stl) KEY  also pas·til  (pstl) KEY 

NOUN:

1. A small medicated or flavored tablet; a troche.
2. A tablet containing aromatic substances that is burned to fumigate or deodorize the air.
3. A pastel paste or crayon.

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ETYMOLOGY:
French, from Spanish pastilla, perfume pellet, and Italian pastillo, pastille, both from Latin pstillus, little loaf, medicine tablet, diminutive of pnis, bread; see p- in Indo-European roots