[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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Word Origin & History

sealed container holding a dose of medicine, 1907, from Fr. (1886), from L. ampulla (see ampoule). A modern borrowing of the word represented by M.E. ampoule.
Online Etymology Dictionary, © 2010 Douglas Harper
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