World English Dictionary
fibre or fiber (ˈfaɪbə)
1.  a natural or synthetic filament that may be spun into yarn, such as cotton or nylon
2.  cloth or other material made from such yarn
3.  a long fine continuous thread or filament
4.  the structure of any material or substance made of or as if of fibres; texture
5.  essential substance or nature: all the fibres of his being were stirred
6.  strength of character (esp in the phrase moral fibre)
7.  See dietary fibre
8.  botany
 a.  a narrow elongated thick-walled cell: a constituent of sclerenchyma tissue
 b.  such tissue extracted from flax, hemp, etc, used to make linen, rope, etc
 c.  a very small root or twig
9.  anatomy any thread-shaped structure, such as a nerve fibre
[C14: from Latin fibra filament, entrails]
fiber or fiber
[C14: from Latin fibra filament, entrails]
'fibred or fiber
'fibered or fiber
'fibreless or fiber
'fiberless or fiber

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

British spelling of fiber (q.v.); for suffix, see -re.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The vegetal fibre is laid on top of the iron sheets.
Each limb, each muscle, each fibre of the huge prostrate body was twisted and
  turned in every direction.
Besides, optical fibre is slowly working its way up his hillside.
Besides being thick, the window was narrow: it was an optical fibre.
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