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