A material made of cellulose pulp derived mainly from wood or rags or certain grasses WordNet 3.0 & Open English WordNet

Paper is a thin sheet material produced by mechanically or chemically processing cellulose fibres derived from wood, rags, grasses, or other vegetable sources in water, draining the water through a fine mesh leaving the fibre evenly distributed on the surface, followed by pressing and drying. Wikipedia

Thin, flat material produced by the compression of fibres. Wikipedia Disambiguation

Thin, flexible material mainly used for writing upon, printing upon, drawing or for packaging Wikidata

Felted or matted sheets of cellulose fibers, formed on a fine-wire screen from a dilute water suspension, and bonded together as the water is removed and the sheet is dried. OmegaWiki

A sheet material used for writing on or printing on (or as a non-waterproof container), usually made by draining cellulose fibres from a suspension in water. Wiktionary

Sheet material. Wiktionary (translation)