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Vacuum pump

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vacuum pump

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

Origin:
1855–60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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pul·som·e·ter   (pŭl-sŏm'ĭ-tər)   
n.  A pump without pistons that operates by means of pulsed condensation of steam. Also called vacuum pump.
vacuum pump  
n.  
  1. A pump used to evacuate an enclosure.

  2. See pulsometer.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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