What does cellulose mean?
Cellulose is an organic compound — specifically, a complex carbohydrate or polysaccharide — made up of long chains of glucose molecules. It is the principal structural component of the cell walls of green plants, algae, and some fungi, lending wood, cotton, and other plant tissues their strength and rigidity. Because plants produce it in vast quantities, cellulose is the most abundant organic polymer on Earth. Humans cannot digest it directly, but as 'dietary fibre' it plays an important role in healthy digestion, and animals such as cows and termites rely on gut microbes to break it down. Industrially, cellulose is indispensable: it is the raw material for paper and cardboard, and its derivatives appear in textiles like rayon, films like cellophane, plastics like celluloid and cellulose acetate, and even early photographic film and explosives such as guncotton. In ordinary usage the word carries a neutral, technical tone and typically appears in discussions of nutrition, botany, manufacturing, and sustainable materials.
A complex carbohydrate (polysaccharide) made of long chains of glucose units, forming the main structural constituent of plant cell walls.
"The cellulose in cotton fibres makes them strong enough to be spun into thread."
Usually treated as uncountable; used mainly in scientific and industrial contexts.
Any of various commercial substances or derivatives prepared from this polysaccharide, used in making paper, textiles, plastics, and coatings.
"The paint contained a modified cellulose that helped it adhere smoothly to the wall."
Often encountered in compound forms such as 'cellulose nitrate' or 'cellulose acetate'.
Rarely used in the plural except in technical chemistry contexts where different types or preparations of cellulose are being compared.
"The study compared the properties of several regenerated celluloses derived from different plant sources."
You eat cellulose every day — it's the fibre in fruits and vegetables your body can't digest — yet termites and cows have gut microbes that happily turn it into dinner.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cellulose
The word 'cellulose' was coined in the first half of the 19th century from the Latin 'cellula', meaning 'small cell' or 'little room' — the same diminutive of 'cella' ('storeroom') that gave English the word 'cell'. French chemist Anselme Payen, who isolated the substance in 1838, applied the name with reference to the plant cells whose walls it composes. It shares this Latin root with words such as 'cellular' and 'cellule'.
Related word forms
How cellulose is actually used
Cellulose is an uncountable noun referring to a specific chemical substance; it does not normally take a plural form. It belongs chiefly to scientific, technical, and industrial registers, though it appears in everyday contexts when discussing dietary fibre or biodegradable packaging. The adjective form 'cellulosic' is common in technical writing about materials and fuels.
Easily confused with cellulose
Cellulite refers to the dimpled, lumpy deposits of subcutaneous fat on the body, whereas cellulose is a plant-based structural carbohydrate found in cell walls.
Cellophane is a thin, transparent film made from regenerated cellulose, while cellulose itself is the raw polysaccharide from which such materials are derived.