vacuum pump

noun
a pump or device by which a partial vacuum can be produced.

Origin:
1855–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
vacuum pump
 
n
a pump for producing a low gas pressure

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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Example sentences
Vacuum pump filters are usually located upstream of the central vacuum pump.
Tesla counters that the fuse for the braking system's electric vacuum pump
  failed.
Peristaltic pumps utilize a self-priming or power-operated vacuum pump.
In this case, leaving the cooler energized while connecting the vacuum pump was
  not necessary.
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