Main Entry: ¹pump

Pronunciation: \ˈpəmp\

Function: noun

Etymology: Middle English pumpe, pompe; akin to Middle Low German pumpe pump, Middle Dutch pompe

Date: 15th century

1 : a device that raises, transfers, delivers, or compresses fluids or that attenuates gases especially by suction or pressure or both
2 : heart
3 : an act or the process of pumping
4 : an energy source (as light) for pumping atoms or molecules
5 : a biological mechanism by which atoms, ions, or molecules are transported across cell membranes — compare sodium pump