a vacuum pump used to assist laboratory filtrations in which a jet of water inside a glass tube entrains air molecules from the system to be evacuated
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
Examples from the Web for filter pump
Historical Examples of filter pump
In the filter-pump, water is used instead of mercury, the pump being connected to an ordinary water-tap.