Source : Webster's Revised Unabridged Dictionary (1913)

Apron \A"pron\ ([=a]"p[u^]rn or [=a]"pr[u^]n; 277), n. [OE.
   napron, OF. naperon, F. napperon, dim. of OF. nape, F. nappe,
   cloth, tablecloth, LL. napa, fr. L. mappa, napkin, table
   napkin. See {Map}.]
   1. An article of dress, of cloth, leather, or other stuff,
      worn on the fore part of the body, to keep the clothes
      clean, to defend them from injury, or as a covering. It is
      commonly tied at the waist by strings.

   2. Something which by its shape or use suggests an apron; as,
      (a) The fat skin covering the belly of a goose or duck.
          [Prov. Eng.] --Halliwell.
      (b) A piece of leather, or other material, to be spread
          before a person riding on an outside seat of a
          vehicle, to defend him from the rain, snow, or dust; a
          boot. ``The weather being too hot for the apron.''
          --Hughes.
      (c) (Gun.) A leaden plate that covers the vent of a
          cannon.
      (d) (Shipbuilding) A piece of carved timber, just above
          the foremost end of the keel. --Totten.
      (e) A platform, or flooring of plank, at the entrance of a
          dock, against which the dock gates are shut.
      (f) A flooring of plank before a dam to cause the water to
          make a gradual descent.
      (g) (Mech.) The piece that holds the cutting tool of a
          planer.
      (h) (Plumbing) A strip of lead which leads the drip of a
          wall into a gutter; a flashing.
      (i) (Zo["o]l.) The infolded abdomen of a crab.

Source : WordNet®

apron
     n 1: a garment of cloth or leather or plastic that is tied about
          the waist and worn to protect your clothing
     2: (golf) the part of the fairway leading onto the green
     3: the part of a modern theater stage between the curtain and
        the orchestra (i.e., in front of the curtain) [syn: {proscenium},
         {forestage}]
     4: a paved surface where aircraft stand while not being used