sheetsheet /ʃit/ ●●● noun [countable] 
1a large piece of thin cloth that you put on a bed to lie on or under: 
Have you changed the sheets (=put clean sheets on the bed)?2a thin flat piece of something such as paper, metal, or glass: a sheet of paper3a large flat area of something such as ice or water that is spread over a surface: The road was covered with a sheet of ice.
1a large piece of thin cloth that you put on a bed to lie on or under: Have you changed the sheets (=put clean sheets on the bed)?2a thin flat piece of something such as paper, metal, or glass: a sheet of paper3a large flat area of something such as ice or water that is spread over a surface: The road was covered with a sheet of ice.
