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piston pump

noun
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Definition of piston pump

: a pump having a reciprocating piston operating in a cylinder so as to impart motion and pressure to the fluid by direct displacement

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“Piston pump.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/piston%20pump. Accessed 24 Oct. 2020.

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