Pump, n.  An hydraulic machine, variously constructed, for raising or transferring fluids, consisting essentially of a moving piece or piston working in a hollow cylinder or other cavity, with valves properly placed for admitting or retaining the fluid as it is drawn or driven through them by the action of the piston.
 Note: ☞ for various kinds of pumps, see Air pump, Chain pump, and Force pump; also, under Lifting, Plunger, Rotary, etc.
 Circulating pump Steam Engine, a pump for driving the condensing water through the casing, or tubes, of a surface condenser.
 Pump brake.  See Pump handle, below.
 Pump dale. See Dale.
 Pump gear, the apparatus belonging to a pump. --Totten.
 Pump handle, the lever, worked by hand, by which motion is given to the bucket of a pump.
 Pump hood, a semicylindrical appendage covering the upper wheel of a chain pump.
 Pump rod, the rod to which the bucket of a pump is fastened, and which is attached to the brake or handle; the piston rod.
 Pump room, a place or room at a mineral spring where the waters are drawn and drunk. [Eng.]
 Pump spear. Same as Pump rod, above.
 Pump stock, the stationary part, body, or barrel of a pump.
 Pump well. Naut. See Well.