cellulose

n. carbohydrate which forms the chief component of plant cell walls

Cellulose is an organic compound  with the formula (C6H10O5)n. It is a structural polysaccharide derived from beta-glucose. Cellulose is the primary structural component of green plants. The primary cell wall of green plants is made of cellulose; acetic acid bacteria are also known to synthesize cellulose, as well as many forms of algae, and the oomycetes. Cellulose was discovered and isolated in the mid-nineteenth century by the French chemist Anselme Payen and, as of the year 2006, the estimated annual production of 1.5x109 tonnes. Some animals, particularly ruminants and termites, can digest cellulose with the help of symbiotic micro-organisms (see methanogen). Cellulose is not digestible by humans and is often referred to as 'dietary fiber' or 'roughage', acting as a hydrophilic bulking agent for feces.
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Cellulose /cel·lu·lose/ a rigid, colorless, unbranched, insoluble, long-chain polysaccharide, consisting of 3000 to 5000 glucose residues and [more]Cellulose - Community and Resources

Noun
1. a polysaccharide that is the chief constituent of all plant tissues and fibers
(hypernym) polysaccharide, polyose
(hyponym) carboxymethyl cellulose
(substance-holonym) cellulose ester

n. cellulose, carbohydrate which forms the chief component of plant cell walls