The Collaborative International Dictionary of English v.0.48:

Pad \Pad\, n. [Perh. akin to pod.]
   1. A soft, or small, cushion; a mass of anything soft;
      stuffing.
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   2. A kind of cushion for writing upon, or for blotting; esp.,
      one formed of many flat sheets of writing paper, or layers
      of blotting paper; a block of paper.
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   3. A cushion used as a saddle without a tree or frame.
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   4. A stuffed guard or protection; esp., one worn on the legs
      of horses to prevent bruising.
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   5. (Zool.) A cushionlike thickening of the skin one the under
      side of the toes of animals.
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   6. A floating leaf of a water lily or similar plant.
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   7. (Med.) A soft bag or cushion to relieve pressure, support
      a part, etc.
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   8. (Naut.) A piece of timber fixed on a beam to fit the curve
      of the deck. --W. C. Russel.
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   9. A measure for fish; as, sixty mackerel go to a pad; a
      basket of soles. [Eng.] --Simmonds.
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   10. A dwelling place, usually an apartment; one's living
       quarters; as, come over to my pad to watch the game.
       [Slang]
       [PJC]

   11. A sum of money paid as a bribe to police officers, shared
       among them; also, the list of such officers receiving
       such a bribe.
       [PJC]

   Pad cloth, a saddlecloth; a housing.

   Pad saddle. See def. 3, above.

   Pad tree (Harness Making), a piece of wood or metal which
      gives rigidity and shape to a harness pad. --Knight.

   on the pad, receiving bribes; -- of police officers.
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