Definition of fibre noun from the Oxford Advanced Learner's Dictionary



    (especially US English fiber) noun
    BrE BrE//ˈfaɪbə(r)//
    ; NAmE NAmE//ˈfaɪbər//
    Diet, Materials and properties
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  1. 1[uncountable] the part of food that helps to keep a person healthy by keeping the bowels working and moving other food quickly through the body synonym roughage dietary fibre Dried fruits are especially high in fibre. a high-/low-fibre diet He has been advised to increase his fibre intake. bran fibre See related entries: Diet
  2. 2[countable, uncountable] a material such as cloth or rope that is made from a mass of natural or artificial threads nylon and other man-made fibres See related entries: Materials and properties
  3. 3[countable] one of the many thin threads that form body tissue, such as muscle, and natural materials, such as wood and cotton cotton/wood/nerve/muscle fibres (literary) She loved him with every fibre of her being.
  4. see also moral fibre, optical fibre
    Word Originlate Middle English (in the sense ‘lobe of the liver’, (plural) ‘entrails’): via French from Latin fibra ‘fibre, filament, entrails’.Extra examples Mechanical filters draw air through flat, coarse fibres. Peaches are a good source of fibre. Wear underwear that is made from natural fibres. foods that are rich in fibre foods that have a high fibre content the problems associated with a low fibre diet your total daily intake of dietary fibre The disease is characterized by degeneration of muscle fibres. The function of nerve fibres is to transmit coded information from one place to another. Wood fibres or synthetic fibres may be used in the manufacturing process.