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or back pressure

[bak-presh-er] /ˈbækˌprɛʃ ər/
a resistant pressure exerted by liquid or gas against the forward motion or flow of an exhaust or pipe system:
Careful control of backpressure ensures an even supply of oil from the well.
Origin of backpressure
First recorded in 1860-65; back1 + pressure Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for back pressure

back pressure

  1. the pressure that opposes the motion of a piston on its exhaust stroke in an internal-combustion engine
  2. the exhaust pressure in external combustion engines
(med) the local pressure that builds up when fluid flow is obstructed in the cardiovascular or urinary systems
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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back pressure in Medicine

back pressure n.
Pressure exerted upstream in the circulation as a result of obstruction to forward flow, as when congestion in the pulmonary circulation results from failure of the left ventricle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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