Main Entry: ¹pump

Pronunciation: \ˈpəmp\

Function: noun

1 : a device that raises, transfers, 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 mechanism by which atoms, ions, or molecules are transported across cell membranes—see proton pump, sodium pump