Etymology
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ampoule (n.)

"small bottle or flask," especially one used for holy liquids, c. 1200, from Old French ampole "flask, vial," from Latin ampulla "small globular flask or bottle," which is of uncertain origin, perhaps a contracted form of amphora. Superseded in English by the form ampulla and later ampul.

updated on January 06, 2017

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Definitions of ampoule from WordNet

ampoule (n.)
a small bottle that contains a drug (especially a sealed sterile container for injection by needle);
Synonyms: phial / vial / ampule / ampul
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.