Definition of fiber in English:

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Pronunciation: /ˈfībər/
(British fibre)


1A thread or filament from which a vegetable tissue, mineral substance, or textile is formed: tropical elements like coconut fibers and branches
More example sentences
  • The original focus industries were pottery, sericulture, carpentry, textiles, coconut fiber, and woven mats.
  • With its qualities of strength and texture, and the ability to be dyed in vibrant colours, silk proved an unequalled fibre for textile production.
  • Hot glass fibers for insulation and nylon fibers for textiles are extruded through platinum sieves.
1.1A substance formed of threads or filaments: ordinary synthetics don’t breathe as well as natural fibers high strength carbon fiber
More example sentences
  • The thing to keep in mind is that your fabric must be a natural fiber: cotton, rayon, silk, or linen.
  • Both fabrics wick perspiration away from your skin while natural fibers like cotton and wool tend to get damp and clammy with sweat.
  • Wear clothes that are made from natural fibres like cotton, linen and silk; they allow your skin to breathe.
1.2A threadlike structure forming part of the muscular, nervous, connective, or other tissue in the human or animal body: there were degenerative changes in muscle fibers figurative she wanted him with every fiber of her being
More example sentences
  • Other structures, such as connective tissue fibers and neuroglia, may be impregnated.
  • At early stages of development, single muscle fibers are innervated by axon terminals from several different motor neurons.
  • Muscle biopsies were freed of connective tissue and muscle fibers were isolated.
1.3Strength of character: a weak person with no moral fiber
More example sentences
  • The strength has to be in the moral fibre of a people, and that sort of strength enables one to provide moral leadership in the world.
  • We can't be having people of poor moral fibre now, can we.
  • Medical research into the drug came to an abrupt end in the mid-1960s when LSD hit the headlines as hazardous to health and a looming shadow over society's moral fibre.
2Dietary material containing substances such as cellulose, lignin, and pectin, which are resistant to the action of digestive enzymes: cereals high in fiber
More example sentences
  • Previous studies have indicated that soybean protein and dietary fiber reduces cholesterol and improves insulin resistance.
  • As pears are dense, they are also a good source of fibre and pectin.
  • High consumption of dietary fiber regulates blood sugar levels, reduces cholesterol and can prevent heart disease and cancer.
roughage, bulk



Example sentences
  • Most muscles in both the forelimb and hindlimb are gracile, with simple parallel fibered strap-like architecture.
  • Additionally, the finely fibered beef has a high moisture content, so it's best prepared in a skillet or over a charcoal grill.


Pronunciation: /ˈfībərləs/
Example sentences
  • The fruit has high pulp content and is fibreless.
  • This is because they eat nothing but refined, fibreless rubbish.
  • The new ginger, fiberless and crisp like a potato, has a mild savory version of the older ginger's flavor, and its texture and mouthfeel make it eminently pickleable.


Late Middle English (in the sense 'lobe of the liver,' (plural) 'entrails'): via French from Latin fibra 'fiber, filament, entrails'.

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