sheet

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A broad rectangular piece of fabric serving as a basic article of bedding.
• noun A broad, thin, usually rectangular mass or piece of material, such as paper, metal, glass, or plywood.
• noun A flat or very shallow, usually rectangular pan used for baking.
• noun A broad, flat, continuous surface or expanse.
• noun A moving expanse.
• noun A newspaper, especially a tabloid.
• noun Geology A broad, relatively thin deposit or layer of igneous or sedimentary rock.
• noun A large block of stamps printed by a single impression of a plate before the individual stamps have been separated.
• noun Mathematics A surface of revolution generated by revolving a hyperbola about one of its two symmetric axes.
• intransitive verb To cover with, wrap in, or provide with a sheet.
• intransitive verb To make into sheets.
• intransitive verb To flow or fall in a sheet.
• adjective Being in the form of a sheet.
• noun A rope or chain attached to one or both of the lower corners of a sail, serving to move or extend it.
• noun The spaces at either end of an open boat in front of and behind the seats.
• intransitive verb To extend in a certain direction. Used of the sheets of a sail.
• idiom (to/in) Intoxicated; drunk.

from The Century Dictionary.

• noun A large square or rectangular piece of linen or cotton spread over a bed, under the covers, next to the sleeper: as, to sleep between sheets.
• noun In general, a broad, usually flat, and relatively thin piece of anything, either very flexible, as linen, paper, etc., or less flexible, or rigid, as lead, tin, iron, glass, etc. (a plate).
• noun One of the separate pieces, of definite size, in which paper is made; the twenty-fourth part of a quire. In the printing-trade the sheet is more clearly defined by naming its size: as, a sheet of cap or a sheet of royal (see sizes of paper, under paper); in bookbinding the sheet is further defined by specifying its fold: as, a sheet of quarto or a sheet of duodecimo.
• noun A newspaper: so called as being usually printed on a large piece of paper and folded.
• noun plural Leaves and pages, as of a book or a pamphlet.
• noun In mathematics, a separate portion of a surface, analogous to the branch of a curve; especially, one of the planes of a Riemann's surface.
• noun [Sheet is often used in composition to denote that the substance to the name of which it is prefixed is in the form of sheets or thin plates: as, sheet-iron, sheet-glass, sheet-tin.]
• noun A broad expanse or surface: as, a sheet of water, of ice, or of flame.
• noun A sail.
• noun Nautical, a rope or chain fastened to one or both of the lower corners of a sail to extend it and hold it extended, or to change its direction.
• noun In anatomy and zoology, a layer; a lamina or lamella, as of any membranous tissue.
• noun In mining, galena in thin and continuous masses. The ore itself is frequently called sheet-mineral.
• To furnish with sheets: as, a sheeted c ouch.
• To fold in a sheet; shroud; cover with or as with a sheet.
• To form into sheets; arrange in or as in sheets.
• An old variant of shoot, used in sheet-anchor, and common in dialectal speech.
• noun plural A commercial name for crude rubber in thin pieces formed by coagulating the latex on a large leaf. See rubber, 3.
• noun In geology: A mass of eruptive rock of great length and breadth as compared with its thickness. Two principal varieties are recognized: surface flows, which are poured out on the surface of the earth, and intruded or intrusive sheets, which are forced between relatively horizontal strata
• noun A deposit of any material, sedimentary or other, which has great areal extent and small thickness.

from the GNU version of the Collaborative International Dictionary of English.

• noun 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.
• noun A broad piece of paper, whether folded or unfolded, whether blank or written or printed upon; hence, a letter; a newspaper, etc.
• noun A single signature of a book or a pamphlet
• noun A broad, thinly expanded portion of metal or other substance.
• noun A broad expanse of water, or the like.
• noun A sail.
• noun (Geol.) An extensive bed of an eruptive rock intruded between, or overlying, other strata.
• noun 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.
• noun The space in the forward or the after part of a boat where there are no rowers
• noun [Sailors' Slang] half drunk.
• noun [Sailors' Slang] very drunk.
• noun lying flat or expanded; not folded, or folded but not bound; -- said especially of printed sheets.