(1):
(n.) Cotton or linen cloth suitable for bed sheets. It is sometimes made of double width.
(2):
(n.) A lining of planks or boards (rarely of metal) for protecting an embankment.
(3):
(p. pr. & vb. n.) of Sheet
(4):
(n.) The act or process of forming into sheets, or flat pieces; also, material made into sheets.