Definitions for vacuum pump
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Princeton's WordNet
air pump, vacuum pump(noun)
a pump that moves air in or out of something
Wiktionary
vacuum pump(Noun)
A piece of equipment used for extraction of gas or vapour from an enclosed space, leaving the container with a partial vacuum.
Origin: vacuum + pump
Citation
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"vacuum pump." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/vacuum pump>.

