sheet 1 
(shēt)
(shēt)n.
1. A thin rectangular piece of fabric for a bed, often used in a pair with one sheet below and one sheet above a person.
2.
a. A broad, thin, usually rectangular mass or piece of material, such as paper, metal, glass, or plywood.
b. A flat or very shallow, usually rectangular pan used for baking.
3. A broad, flat, continuous surface or expanse: a sheet of ice.
4. A moving expanse: a sheet of flames.
5. A newspaper, especially a tabloid.
6. Computers A single page of rows and columns constituting a subunit of a spreadsheet.
7. Geology A broad, relatively thin deposit or layer of igneous or sedimentary rock.
8. A large block of stamps printed by a single impression of a plate before the individual stamps have been separated.
9. Mathematics A surface of revolution generated by revolving a hyperbola about one of its two symmetric axes.
v. sheet·ed, sheet·ing, sheets
v.tr.
1. To cover with, wrap in, or provide with a sheet.
2. To make into sheets.
v.intr.
To flow or fall in a sheet: rain sheeting against the windshield.
adj.
Being in the form of a sheet: sheet aluminum.
[Middle English schete, cloth, from Old English scēte; see skeud- in the Appendix of Indo-European roots.]