Definition of fiber in English:


(British fibre)


  • 1A thread or filament from which a vegetable tissue, mineral substance, or textile is formed.

    ‘tropical elements like coconut fibers and branches’
    • ‘Blankets, in the form of batts or rolls, are flexible products made from mineral fibers.’
    • ‘Fabric wallpaper are usually made of cotton, linen, or other natural plant fibers, such as grass cloth, hemp, or burlap.’
    • ‘The EPCH also plans to include a complete product group of floor coverings made of natural fibres including coir, jute, cotton, silk and wool.’
    • ‘This superfine cloth comes from our own traditional handlooms woven out of natural fibres like cotton, linen, silk, wool, jute, etc. and soaked in natural dyes.’
    • ‘A rope is a ply of natural threads or synthetic fibers.’
    • ‘The original focus industries were pottery, sericulture, carpentry, textiles, coconut fiber, and woven mats.’
    • ‘Coir is a natural fibre made from coconuts and used for matting, screening, baskets and other products.’
    • ‘Hot glass fibers for insulation and nylon fibers for textiles are extruded through platinum sieves.’
    • ‘Until the 19th cent. wool fibres dominated knitting but other textile fibres came into use.’
    • ‘Felt fabric is a compact sheet of entangled, not woven wool, fur, sometimes cotton fibers.’
    • ‘They use acid-free paper made from cotton, which is much more durable than paper made from wood because the cotton fibers are much longer.’
    • ‘Because they are composed of vegetable fibers, EcoDragon's sandals can be composted once they're worn out.’
    • ‘With its qualities of strength and texture, and the ability to be dyed in vibrant colours, silk proved an unequalled fibre for textile production.’
    • ‘While wool is excellent at hiding dirt, any dirt that does become embedded in the carpet is prone to damage the fibers by abrasion.’
    • ‘A buff is made from a non-woven fabric where the fibers are first carded and formed into a fairly thick fleece.’
    • ‘Jute is a vegetable fiber cultivated in China, India, Pakistan, and other south Asia countries.’
    • ‘Vegetable fibers were used by ancient man for fishing and trapping.’
    • ‘It is also the most stain resistant because unlike wool, its fibers do not accept dyes and colors easily.’
    • ‘Hats, mats, hammocks, and baskets are made with different types of cane and reed as well as fibers from the maguey cactus.’
    • ‘The asbestos fibres got stuck in the hand-knitted socks and jumpers.’
    thread, strand, tendril, filament
    View synonyms
    1. 1.1A substance formed of threads or filaments.
      ‘ordinary synthetics don't breathe as well as natural fibers’
      ‘high strength carbon fiber’
      • ‘Merino Wool is a natural fiber that absorbs 10 times more moisture than synthetics, and it does not hold odor.’
      • ‘It is possible to dye a natural fiber like pashmina, but there is no guarantee to the outcome, either in color or texture.’
      • ‘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.’
      • ‘Sweeney prints mainly on silk, but also onto linen, cotton and other natural fibres.’
      • ‘Wear clothes that are made from natural fibres like cotton, linen and silk; they allow your skin to breathe.’
      • ‘Floral prints in combination with light, natural fibres like chiffon, silk and linen underscore this young and natural look.’
      • ‘Natural fibres in cool lightweight fabrics, teamed with slightly shaped shirts to skim the body's contours, will be de rigueur.’
      • ‘Opt for cotton, linen and other natural fibers that help absorb moisture and allow your body to breathe.’
      • ‘In general, if the ash is soft and the odor is of burning hair or paper, the fabric is a natural fiber.’
      • ‘They work in a variety of disciplines including ceramics, fibres, glass, mirror design, jewellery and photography.’
      • ‘The child should wear layered natural fibers and wool socks, weather permitting.’
      • ‘Natural fibres such as cotton and wool can usually be washed and worn repeatedly and are always a safe bet, whereas embroidered pieces and handmade garments are treasures and should be treated with respect.’
      • ‘Natural fibres like cotton and wool can usually be washed and worn repeatedly and are always a safe bet.’
      material, substance, cloth, fabric, stuff
      View synonyms
    2. 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’
      • ‘Unlike many body tissues, nerve cells and fibers in the central nervous system cannot regenerate.’
      • ‘Most simply, muscle fibers activated by the nervous system produce tensile forces that are transmitted to the skeleton.’
      • ‘At early stages of development, single muscle fibers are innervated by axon terminals from several different motor neurons.’
      • ‘It was defined as the most distal part of the muscle in which tendon fibers could be visualized.’
      • ‘My rheumatologist thought I might have torn muscle fibers in the latissimus dorsi and tried an injection of triamcinolone.’
      • ‘The skin of D. holocanthus is highly elastic because of microfolds in the epidermis and collagen fibers of the dermis.’
      • ‘Striated skeletal muscle fibers vary in length between 2 and 25 cm, depending upon the muscle.’
      • ‘Muscle biopsies were freed of connective tissue and muscle fibers were isolated.’
      • ‘Usually, leiomyosarcomas originate from the renal capsule, muscle fibers in the renal pelvis, or the walls of renal vessels.’
      • ‘Huge masses of them are scattered also between the adjacent striated muscle fibers.’
      • ‘The middle trapezius muscle fibers, although strong, lie very close to the axis of rotation of the scapula.’
      • ‘Heat alters the fibres of connective tissue, initially by making them shorter and thicker, and then by altering the structure.’
      • ‘The basic functional unit of muscle is the motor unit, which consists of a motoneuron and the muscle fibers that it innervates.’
      • ‘Loose connective tissue consists of fibers running in all directions through a semifluid matrix.’
      • ‘Individual muscle fibers may be innervated by one or both of the excitatory neurons, and generally receive inhibitory input as well.’
      • ‘Its fibers are found in connective tissue, including skin, bone, ligaments, and cartilage.’
      • ‘Acetylcholine acts as a transmitter between motor nerves and the fibres of skeletal muscle at all neuromuscular junctions.’
      • ‘A motor unit is made up of a single nerve axon and the muscle fibers it supplies.’
      • ‘The muscle fibers in the mucosal muscular layer are also longitudinal, oriented along the axis of the cylindrical organ.’
      • ‘Other structures, such as connective tissue fibers and neuroglia, may be impregnated.’
    3. 1.3Strength of character.
      ‘a weak person with no moral fiber’
      • ‘His weak moral fibre, mixed with his genuine desire to help Kathy, does nothing but tear the fabric of both her life and Behrani's.’
      • ‘Well I like France, at present they have slightly more moral fibre than the British Government (not a huge challenge, admittedly).’
      • ‘We can't be having people of poor moral fibre now, can we.’
      • ‘Because while we may find a snippet of moral fibre here and detect evidence of it there, somehow it seems to be far less plentiful these days.’
      • ‘His flying was initially hampered by a rugby injury and when he reported the injury he was suspected of having a lack of moral fibre.’
      • ‘It is also intended, no doubt, to contrast British efficiency and moral fibre with Spanish and Portuguese fecklessness.’
      • ‘But the logical spin-off of the celebrity chef has been the celebration of cooking, an activity in which new moral fibre is being endlessly invested.’
      • ‘‘We [viz fat people] are normally considered to be lazy, slobbish and lacking in moral fibre,’ she declares.’
      • ‘That moral fibre will defeat the fanaticism of these terrorists and their supporters.’
      • ‘But in the very same essay, Macaulay supposes Bacon the man to be thoroughly deceitful, self-seeking, and lacking in moral fibre.’
      • ‘People that live on the streets do not necessarily lack moral fibre.’
      • ‘His lack of moral fibre and intellectual courage are two of his shortcomings that infuriate the most.’
      • ‘Alarmed by the decline of empire, he determined to instil moral fibre and intrepid ways into lads who, as well as contributing to civic good, might somehow keep the colonial flag flying.’
      • ‘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.’
      • ‘It all makes me feel rather sorry for men: as if being present at the birth has become some sort of test of moral fibre.’
      • ‘Only those with inordinate levels of moral fibre can visit the venue during those first couple of weeks in April and return with their former principles intact.’
      • ‘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.’
      • ‘He practices his speech on moral fibre that should land him a scholarship to a prestigious university, while darting envious glances at his partying schoolmates.’
      • ‘This is so because some drugs that are being abused are not only dangerous but pose a very serious threat to life and society's moral fibre.’
      • ‘After all, your elders are of a stronger moral fibre, having been tested in life.’
  • 2Dietary material containing substances such as cellulose, lignin, and pectin, which are resistant to the action of digestive enzymes.

    ‘cereals high in fiber’
    • ‘Salad leaves are rich in a range of nutrients including fibre, folate and so-called carotenoids such as alphacarotene, lutein and zeaxanthin.’
    • ‘Actual plant starches contain a certain amount of cellulose, another carbohydrate which is not digested by humans but supplies essential dietary fibre.’
    • ‘The complex carbohydrates and fiber in whole wheat slow the release of blood sugar, providing steady energy.’
    • ‘Dry beans, peas, and lentils offer protein and fiber without the cholesterol and fat that meats have.’
    • ‘Dietary fibre consists of plant material such as cellulose, hemicellulose, pectin, polysaccharides, gums, mucilage and lignin.’
    • ‘In addition, they contain large amounts of soluble fiber, including pectin that helps to lower cholesterol.’
    • ‘It is what is lacking in our food - the vitamins, minerals, fibre, phytochemicals and micro-nutrients in a plant-based diet - that counts.’
    • ‘They are high in fibre and a substance called pectin, both of which may help to control cholesterol levels in the bloodstream.’
    • ‘Sprouts are an excellent source of digestible protein, fibre, and Vitamin C, and are full of antioxidants.’
    • ‘Made out of lentils, beans and spices, these little balls are rich in fibre and protein.’
    • ‘As pears are dense, they are also a good source of fibre and pectin.’
    • ‘Each recipe is analyzed for calcium but also for calories, protein, fat, carbohydrate, dietary fiber, sodium, and magnesium.’
    • ‘High consumption of dietary fiber regulates blood sugar levels, reduces cholesterol and can prevent heart disease and cancer.’
    • ‘Net impact carbs result from replacing wheat flour with soy flour or adding fiber, sugar alcohols or fat.’
    • ‘It is a rich source of carbohydrates, protein, fiber, amino acids, minerals, sterols, and fatty acids.’
    • ‘Besides soy protein, the yogurts include added fiber and vitamins C and D and are lactose reduced.’
    • ‘Protein, fat and fiber keep blood sugar levels more even and help keep such cravings under control.’
    • ‘Yes, a ruminant couldn't live on roughage without the bugs, because these digest the tough cellulose fibre in the plants the animals eat.’
    • ‘And a kind of fiber in apples called pectin reduces cholesterol and helps maintain steady blood sugar levels.’
    • ‘Previous studies have indicated that soybean protein and dietary fiber reduces cholesterol and improves insulin resistance.’
    roughage, bulk, fibrous material
    View synonyms


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