pump

¹pump

noun \ˈpəmp\

Definition of PUMP

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