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(General Engineering) a pump that raises a fluid to a higher level. It usually consists of a piston and vertical cylinder with flap or ball valves in both piston and cylinder base. Compare force pump
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014