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3 definitions found
 for Pump well
From The Collaborative International Dictionary of English v.0.48 :

  Pump \Pump\, n. [Akin to D. pomp, G. pumpe, F. pompe; of unknown
     origin.]
     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.
     [1913 Webster]
  
     Note: for various kinds of pumps, see Air pump, Chain
           pump, and Force pump; also, under Lifting,
           Plunger, Rotary, etc.
           [1913 Webster]
  
     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.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Well \Well\, n. [OE. welle, AS. wella, wylla, from weallan to
     well up, surge, boil; akin to D. wel a spring or fountain.
     ????. See Well, v. i.]
     [1913 Webster]
     1. An issue of water from the earth; a spring; a fountain.
        [1913 Webster]
  
              Begin, then, sisters of the sacred well. --Milton.
        [1913 Webster]
  
     2. A pit or hole sunk into the earth to such a depth as to
        reach a supply of water, generally of a cylindrical form,
        and often walled with stone or bricks to prevent the earth
        from caving in.
        [1913 Webster]
  
              The woman said unto him, Sir, thou hast nothing to
              draw with, and the well is deep.      --John iv. 11.
        [1913 Webster]
  
     3. A shaft made in the earth to obtain oil or brine.
        [1913 Webster]
  
     4. Fig.: A source of supply; fountain; wellspring. "This well
        of mercy." --Chaucer.
        [1913 Webster]
  
              Dan Chaucer, well of English undefiled. --Spenser.
        [1913 Webster]
  
              A well of serious thought and pure.   --Keble.
        [1913 Webster]
  
     5. (Naut.)
        (a) An inclosure in the middle of a vessel's hold, around
            the pumps, from the bottom to the lower deck, to
            preserve the pumps from damage and facilitate their
            inspection.
        (b) A compartment in the middle of the hold of a fishing
            vessel, made tight at the sides, but having holes
            perforated in the bottom to let in water for the
            preservation of fish alive while they are transported
            to market.
        (c) A vertical passage in the stern into which an
            auxiliary screw propeller may be drawn up out of
            water.
        (d) A depressed space in the after part of the deck; --
            often called the cockpit.
            [1913 Webster]
  
     6. (Mil.) A hole or excavation in the earth, in mining, from
        which run branches or galleries.
        [1913 Webster]
  
     7. (Arch.) An opening through the floors of a building, as
        for a staircase or an elevator; a wellhole.
        [1913 Webster]
  
     8. (Metal.) The lower part of a furnace, into which the metal
        falls.
        [1913 Webster]
  
     Artesian well, Driven well. See under Artesian, and
        Driven.
  
     Pump well. (Naut.) See Well, 5
        (a), above.
  
     Well boring, the art or process of boring an artesian well.
        
  
     Well drain.
        (a) A drain or vent for water, somewhat like a well or
            pit, serving to discharge the water of wet land.
        (b) A drain conducting to a well or pit.
  
     Well room.
        (a) A room where a well or spring is situated; especially,
            one built over a mineral spring.
        (b) (Naut.) A depression in the bottom of a boat, into
            which water may run, and whence it is thrown out with
            a scoop.
  
     Well sinker, one who sinks or digs wells.
  
     Well sinking, the art or process of sinking or digging
        wells.
  
     Well staircase (Arch.), a staircase having a wellhole (see
        Wellhole
        (b) ), as distinguished from one which occupies the whole
            of the space left for it in the floor.
  
     Well sweep. Same as Sweep, n., 12.
  
     Well water, the water that flows into a well from
        subterraneous springs; the water drawn from a well.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  pump well
      n 1: an enclosure in the middle of a ship's hold that protects
           the ship's pumps

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