pump
n 1 : a device that raises, transfers, or compresses fluids or that attenuates gases esp. 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 (as the sodium pump) for pumping atoms, ions, or molecules vi : to work a pump : raise or move a fluid with a pump vt 1 : to raise (as water) with a pump 2 : to draw fluid from with a pump 3 : to transport (as ions) against a concentration gradient by the expenditure of energy 4 a : to excite (as atoms or molecules) esp. so as to cause emission of coherent monochromatic electromagnetic radiation (as in a laser) b : to energize (as a laser) by pumping .
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