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| back pres·sure |
noun |
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1. resistant pressure: resistant pressure exerted by a solid, liquid, or gas to the forward motion of a system, especially the pressure opposing the exhaust stroke of a piston in an internal-combustion engine
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2. energy oil or gas pressure: the pressure exerted by fluids in the bore of an oil well on the oil and gas in the reservoir. Careful control of this pressure ensures an even supply of oil.
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3. medicine pressure due to obstruction: pressure within a blood vessel or the urinary system that builds up when there is an obstruction to the flow of fluid
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