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1. (Mechanical Engineering) engineering
a. the pressure that opposes the motion of a piston on its exhaust stroke in an internal-combustion engine
b. the exhaust pressure in external combustion engines
2. (Pathology) med the local pressure that builds up when fluid flow is obstructed in the cardiovascular or urinary systems
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014