Source : Webster's Revised Unabridged Dictionary (1913)

Sheet \Sheet\, n. [OE. shete, schete, AS. sc[=e]te, sc[=y]te,
   fr. sce['a]t a projecting corner, a fold in a garment (akin
   to D. schoot sheet, bosom, lap, G. schoss bosom, lap, flap of
   a coat, Icel. skaut, Goth. skauts the hem of a garment);
   originally, that which shoots out, from the root of AS.
   sce['o]tan to shoot. [root]159. See {Shoot}, v. t.]
   In general, a large, broad piece of anything thin, as paper,
   cloth, etc.; a broad, thin portion of any substance; an
   expanded superficies. Specifically:
   (a) A broad piece of cloth, usually linen or cotton, used for
       wrapping the body or for a covering; especially, one used
       as an article of bedding next to the body.

             He fell into a trance, and saw heaven opened, and a
             certain vessel descending unto him, as it had been
             a great sheet knit at the four corners. --Acts x.
                                                  10, 11.

             If I do die before thee, prithee, shroud me In one
             of those same sheets.                --Shak.
   (b) A broad piece of paper, whether folded or unfolded,
       whether blank or written or printed upon; hence, a
       letter; a newspaper, etc.
   (c) A single signature of a book or a pamphlet; in pl., the
       book itself.

             To this the following sheets are intended for a
             full and distinct answer.            --Waterland.
   (d) A broad, thinly expanded portion of metal or other
       substance; as, a sheet of copper, of glass, or the like;
       a plate; a leaf.
   (e) A broad expanse of water, or the like. ``The two
       beautiful sheets of water.'' --Macaulay.
   (f) A sail. --Dryden.
   (g) (Geol.) An extensive bed of an eruptive rock intruded
       between, or overlying, other strata.

   2. [AS. sce['a]ta. See the Etymology above.] (Naut.)
      (a) A rope or chain which regulates the angle of
          adjustment of a sail in relation in relation to the
          wind; -- usually attached to the lower corner of a
          sail, or to a yard or a boom.
      (b) pl. The space in the forward or the after part of a
          boat where there are no rowers; as, fore sheets; stern
          sheets.

   Note: Sheet is often used adjectively, or in combination, to
         denote that the substance to the name of which it is
         prefixed is in the form of sheets, or thin plates or
         leaves; as, sheet brass, or sheet-brass; sheet glass,
         or sheet-glass; sheet gold, or sheet-gold; sheet iron,
         or sheet-iron, etc.

   {A sheet in the wind}, half drunk. [Sailors' Slang]

   {Both sheets in the wind}, very drunk. [Sailors' Slang]

   {In sheets}, lying flat or expanded; not folded, or folded
      but not bound; -- said especially of printed sheets.

   {Sheet bend} (Naut.), a bend or hitch used for temporarily
      fastening a rope to the bight of another rope or to an
      eye.

   {Sheet lightning}, {Sheet piling}, etc. See under
      {Lightning}, {Piling}, etc.

Piling \Pil"ing\, n. [See {Pile} a stake.]
   A series of piles; piles considered collectively; as, the
   piling of a bridge.

   {Pug piling}, sheet piles connected together at the edges by
      dovetailed tongues and grooves.

   {Sheet piling}, a series of piles made of planks or half logs
      driven edge to edge, -- used to form the walls of
      cofferdams, etc.

Source : WordNet®

sheet piling
     n : a pile in a row of piles driven side by side to retain earth
         or prevent seepage [syn: {sheet pile}, {sheath pile}]