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The Collaborative International Dictionary of English v.0.48 (gcide)

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.
[1913 Webster]

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) (Zool.) The infolded abdomen of a crab.
[1913 Webster]