[am-pyool, -pool]
noun Medicine/Medical.
a sealed glass or plastic bulb containing solutions for hypodermic injection.
Also, ampul, ampoule.

1175–1225; < French < Latin ampulla ampulla; replacing Middle English ampulle < Old French < Latin; replacing Old English ampella, ampulla < Latin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ampoule or esp (US) ampule (ˈæmpuːl, -pjuːl)
med a small glass vessel in which liquids for injection are hermetically sealed
ampule or esp (US) ampule

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"small bottle or flask," esp. one used for holy liquids, c.1200, from O.Fr. ampole, from L. ampulla "small globular flask or bottle," of uncertain origin, perhaps a contracted form of amphora.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The labels on each ampoule have five lines of printed information on them.
Fill the ampoule with a sample of water by snapping the ampoule's tip.
The ampoule contains a strongly acidic solution of uranium.
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