WordReference Random House Learner's Dictionary of American English © 2017
sheet1 /ʃit/USA pronunciation   n. [countable]
  1. a large rectangular piece of cotton used for bedding.
  2. a wide, thin surface or covering:a sheet of ice.
  3. a thin, rectangular piece of material, such as glass or tin.
  4. a rectangular piece of paper, esp. one on which to write:Take out a sheet of paper and answer these questions.
  5. a wide extent or expanse, as of fire or water:sheets of flame; sheets of rain.

WordReference Random House Unabridged Dictionary of American English © 2017
sheet1  (shēt),USA pronunciation n. 
  1. a large rectangular piece of cotton, linen, or other material used as an article of bedding, commonly spread in pairs so that one is immediately above and the other immediately below the sleeper.
  2. a broad, relatively thin, surface, layer, or covering.
  3. Photographya relatively thin, usually rectangular form, piece, plate, or slab, as of photographic film, glass, metal, etc.
  4. material, as metal or glass, in the form of broad, relatively thin pieces.
  5. Nautical, Naval Termsa sail, as on a ship or boat.
  6. a rectangular piece of paper or parchment, esp. one on which to write.
  7. a newspaper or periodical.
  8. Printinga large, rectangular piece of printing paper, esp. one for printing a complete signature.
  9. Stamps[Philately.]the impression from a plate or the like on a single sheet of paper before any division of the paper into individual stamps.
  10. an extent, stretch, or expanse, as of fire or water:sheets of flame.
  11. a thin, flat piece of metal or a very shallow pan on which to place food while baking.
  12. Geologya more or less horizontal mass of rock, esp. volcanic rock intruded between strata or poured out over a surface.
  13. Mathematics
    • one of the separate pieces making up a geometrical surface:a hyperboloid of two sheets.
    • one of the planes or pieces of planes making up a Riemann surface.
  14. Crystallographya type of crystal structure, as in mica, in which certain atoms unite strongly in two dimensions to form a layer that is weakly joined to others.

  1. to furnish with a sheet or sheets.
  2. to wrap in a sheet.
  3. to cover with a sheet or layer of something.
sheetless, adj. 
sheetlike′, adj. 
  • bef. 900; Middle English shete, Old English scēte (north), scīete, derivative of scēat corner, lap, sheet, region; cognate with Dutch schoot, German Schoss, Old Norse skaut

sheet2  (shēt),USA pronunciation n. 
  1. Naval Terms[Naut.]
    • , Naval Terms, Nauticala rope or chain for extending the clews of a square sail along a yard.
    • , Nautical, Naval Termsa rope for trimming a fore-and-aft sail.
    • , Nautical, Naval Termsa rope or chain for extending the lee clew of a course.
  2. three sheets in or  to the wind, [Slang.]intoxicated.

  1. Nautical, Naval Termsto trim, extend, or secure by means of a sheet or sheets.
  • 1300–50; Middle English shete, shortening of Old English scēatlīne, equivalent. to scēat(a) lower corner of a sail (see sheet1) + līne line1, rope; cognate with Low German schote

Collins Concise English Dictionary © HarperCollins Publishers::

sheet /ʃiːt/ n
  1. a large rectangular piece of cotton, linen, etc, generally one of a pair used as inner bedclothes
  2. a thin piece of a substance such as paper, glass, or metal, usually rectangular in form
  3. (as modifier): sheet iron
  4. a broad continuous surface; expanse or stretch: a sheet of rain
  5. a newspaper, esp a tabloid
  6. a piece of printed paper to be folded into a section for a book
  1. (transitive) to provide with, cover, or wrap in a sheet
Etymology: Old English sciete; related to sceat corner, lap, Old Norse skaut, Old High German scōz lap
sheet /ʃiːt/ n
  1. a line or rope for controlling the position of a sail relative to the wind
Etymology: Old English scēata corner of a sail; related to Middle Low German schōte rope attached to a sail; see sheet1

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