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water hammer

 - 2 dictionary results

water hammer

–noun
the concussion and accompanying noise that result when a volume of water moving in a pipe suddenly stops or loses momentum.

Origin:
1795–1805
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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water hammer  
n.  
  1. A banging noise heard in a water pipe following an abrupt alteration of the flow with resultant pressure surges.

  2. A banging noise in steam pipes, caused by steam bubbles entering a cold pipe partially filled with water.

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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