Source : Webster's Revised Unabridged Dictionary (1913)

Ledge \Ledge\ (l[e^]j), n. [Akin to AS. licgan to lie, Icel.
   liggja; cf. Icel. l["o]gg the ledge or rim at the bottom of a
   cask. See {Lie} to be prostrate.] [Formerly written {lidge}.]
   1. A shelf on which articles may be laid; also, that which
      resembles such a shelf in form or use, as a projecting
      ridge or part, or a molding or edge in joinery.

   2. A shelf, ridge, or reef, of rocks.

   3. A layer or stratum.

            The lowest ledge or row should be of stone. --Sir H.
                                                  Wotton.

   4. (Mining) A lode; a limited mass of rock bearing valuable
      mineral.

   5. (Shipbuilding) A piece of timber to support the deck,
      placed athwartship between beams.

Source : WordNet®

ledge
     n : a projecting ridge on a mountain or submerged under water
         [syn: {shelf}]