1a large rectangular piece of cotton or other fabric, used on a bed to cover the mattress and as a layer beneath blankets when these are used. 2a rectangular piece of paper, especially one of a standard size produced commercially and used for writing and printing on:a sheet of unmarked paper a quantity of text or other information contained on a sheet of paper:he produced yet another sheet of figures Printing a flat piece of paper as opposed to a reel of continuous paper, the bound pages of a book, or a folded map. all the postage stamps printed on one piece of paper:a sheet of 1p stamps a map, especially one part of a series covering a larger area.
3a broad flat piece of material such as metal or glass:the small pipe has been formed from a flat sheet of bronze an extensive unbroken surface area of something:Loch Affric is a lovely sheet of water among trees [as modifier]:sheet ice a broad moving mass of flames or water:the rain was still falling in sheets 1 [with object] cover with or wrap in a sheet of cloth:lorry drivers don’t sheet their loads
2 [no object, with adverbial of direction] (of rain) fall in large quantities:rain sheeted down