fibre

noun

UKFY-buh/ˈfaɪ.bə(ɹ)/FY-bur/ˈfaɪbɚ/

Pluralfibres (some meanings)

US spellingfiber

8 meanings of fibre

1
mass of strandsnoununcountable
Material that is made up of lots of long, thin strands.
The pillow is filled with soft fibre instead of feathers.
Birds often line their nests with plant fibre.
2
nouncountable
One long, thin strand of a material, often twisted together with others to make thread.
A few blue fibres from her jumper were stuck to the sofa.
Each cotton fibre is thinner than a human hair.
3
in foodnoununcountable
The part of food from plants, like vegetables, that your body cannot digest.
Brown bread has more fibre than white bread.
The doctor told him to eat more fibre and drink more water.
UsageSay food is high in fibre, or eat more fibre.
4
broadbandnoununcountable
A fast internet connection using cables carrying light for some or all of its route, or the service itself.
We finally have fibre at home, and films don't stop to load any more.
Is fibre available on your street yet?
UsagePeople say they have fibre or get fibre at home.
5
body cellnouncountable
One of the long, thin cells or threads in your body, like those in muscles or nerves.
Under the microscope, each fibre in the muscle looked like a long thin tube.
Hard exercise can cause tiny tears in your muscle fibres.
Note

6
inner strengthnoununcountable
Strength of character that helps you stay firm and do what is right.
He showed great moral fibre by refusing to cheat in the exam.
He didn't have the moral fibre to tell the truth.
UsageUsually moral fibre, as in lack the moral fibre to do something.
Note
7
noun
In maths, all the things that a mapping sends to one chosen point.
8
noun
In computing, a small, light kind of thread: one line of steps a program carries out.

Can you tell the meanings of fibre apart? Answer 3 quick questions from this page, or write your own sentence and AI will check it.

It comes from the French word fibre, which goes back to the Latin word fibra.

Checked 5 Nov 2026 · 2 facts