PUMP

I. noun Etymology: Middle English ~e, pompe; akin to Middle Low German ~e ~, Middle Dutch pompe Date: 15th century a device that raises, transfers, delivers, or compresses fluids or that attenuates gases especially by suction or pressure or both, heart , an act or the process of ~ing, an energy source (as light) for ~ing atoms or molecules, a biological mechanism by which atoms, ions, or molecules are transported across cell membranes, II. verb Date: 1508 intransitive verb to work a ~ ; raise or move a fluid with a ~, to exert oneself to ~ or as if to ~ something, to move in a manner that resembles the action of a ~ handle, transitive verb 1. to raise (as water) with a ~, to draw fluid from with a ~, to pour forth, deliver, or draw with or as if with a ~ , 3. to question persistently , to elicit by persistent questioning, 4. to operate by manipulating a lever, to manipulate as if operating a ~ handle , to cause to move with an action resembling that of a ~ handle , to transport (as ions) against a concentration gradient by the expenditure of energy, 6. to excite (as atoms or molecules) especially so as to cause emission of coherent monochromatic electromagnetic radiation (as in a laser), to energize (as a laser) by ~ing, III. noun Etymology: origin unknown Date: 1555 a shoe that grips the foot chiefly at the toe and heel