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"small bottle or flask," especially one used for holy liquids, c.1200, from Old French ampole, from Latin ampulla "small globular flask or bottle," of uncertain origin, perhaps a contracted form of amphora.
ampoule am·poule or am·pule or am·pul (ām'pōōl, -pyōōl)
A hermetically sealed vial, usually made of glass, that contains a sterile medicinal solution or a powder to be made into a solution for subcutaneous, intramuscular, or intravenous injection.