Try Our Apps


Famous Last Words


[fahy-ber] /ˈfaɪ bər/
noun, Chiefly British.


[fahy-ber] /ˈfaɪ bər/
a fine, threadlike piece, as of cotton, jute, or asbestos.
a slender filament:
a fiber of platinum.
filaments collectively.
matter or material composed of filaments:
a plastic fiber.
something resembling a filament.
an essential character, quality, or strength:
people of strong moral fiber.
  1. filamentous matter from the bast tissue or other parts of plants, used for industrial purposes.
  2. a slender, threadlike root of a plant.
  3. a slender, tapered cell which, with like cells, serves to strengthen tissue.
Anatomy, Zoology. a slender, threadlike element or cell, as of nerve, muscle, or connective tissue.
Nutrition.. Also called bulk, dietary fiber, roughage.
  1. the structural part of plants and plant products that consists of carbohydrates, as cellulose and pectin, that are wholly or partially indigestible and when eaten stimulate peristalsis in the intestine.
  2. food containing a high amount of such carbohydrates, as whole grains, fruits, and vegetables.
Chemistry. vulcanized fiber.
Optics. optical fiber.
Also, especially British, fibre.
Origin of fiber
1350-1400; 1970-75 for def 9; Middle English fibre (< Middle French) < Latin fibra filament
Related forms
fiberless, adjective
interfiber, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
Examples from the Web for fibre
Contemporary Examples
Historical Examples
  • I love him with every fibre of my whole being, and yet I cannot trust him.

    The Mistress of Shenstone Florence L. Barclay
  • They are then "retted," or beaten, and the fibre is removed.

    Commercial Geography Jacques W. Redway
  • The bracing effect of the sea air was being felt in every fibre of my frame.

    A New Sensation Albert Ross
  • Was it an unexpected weakness of fibre that made it impossible?

    Robert Elsmere Mrs. Humphry Ward
  • Runciman, however, was much more in fibre than a mere schoolmaster.

    Side Lights James Runciman
  • Make little loop of paper, or of wire, and attach your fibre to it.

  • When viewed by the aid of a powerful achromatic microscope, the central part of the fibre has a singularly glittering appearance.

    Sheep, Swine, and Poultry Robert Jennings
  • Ah, in him ran the fibre of the hero, no matter what might have been his mistakes!

    The Art of Disappearing John Talbot Smith
  • The length of the fibre, moreover, cannot be determined with any absolute certainty from the thickness of the vein.

    Asbestos Robert H. Jones
British Dictionary definitions for fibre


a natural or synthetic filament that may be spun into yarn, such as cotton or nylon
cloth or other material made from such yarn
a long fine continuous thread or filament
the structure of any material or substance made of or as if of fibres; texture
essential substance or nature: all the fibres of his being were stirred
strength of character (esp in the phrase moral fibre)
  1. a narrow elongated thick-walled cell: a constituent of sclerenchyma tissue
  2. such tissue extracted from flax, hemp, etc, used to make linen, rope, etc
  3. a very small root or twig
(anatomy) any thread-shaped structure, such as a nerve fibre
Derived Forms
fibred, (US) fibered, adjective
fibreless, (US) fiberless, adjective
Word Origin
C14: from Latin fibra filament, entrails


the usual US spelling of fibre
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for fibre

chiefly British English spelling of fiber (q.v.); for spelling, see -re.



1530s, from French fibre (14c.), from Latin fibra "a fiber, filament," of uncertain origin, perhaps related to Latin filum "thread," or from root of findere "to split." Fiberboard is from 1897; Fiberglas is 1937, U.S. registered trademark name; and fiber optics is from 1956.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
fibre in Medicine

fiber fi·ber (fī'bər)

  1. A slender thread or filament.

  2. Extracellular filamentous structures such as collagenic or elastic connective tissue fibers.

  3. The nerve cell axon with its glial envelope.

  4. An elongated threadlike cell, such as a muscle cell or one of the epithelial cells of the lens of the eye.

  5. Coarse, indigestible plant matter, consisting primarily of polysaccharides such as cellulose, that when eaten stimulates intestinal peristalsis. Also called roughage.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
fibre in Science
  1. The parts of grains, fruits, and vegetables that contain cellulose and are not digested by the body. Fiber helps the intestines absorb water, which increases the bulk of the stool and causes it to move more quickly through the colon.

  2. One of the elongated, thick-walled cells, often occurring in bundles, that give strength and support to tissue in vascular plants. Fibers are one type of sclerenchyma cell.

  3. Any of the elongated cells of skeletal or cardiac muscle, made up of slender threadlike structures called myofibrils.

  4. The axon of a neuron.

fibrous adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for fibre

Some English speakers likely know this word

Word Value for fibre

Scrabble Words With Friends

Nearby words for fibre