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Definition of fiber

fiber

/ˈfaɪ.bɚ/
(UK: fibre)
fi · ber

Plural:fibers
•
Adjective:fibrous
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fiber Lexical Profile

fiber Game Scores & Validity

• noun

1

American A thin, thread-like structure or filament that forms part of biological tissues, mineral substances, or textiles.

Example

"Cotton is a natural fiber widely used in the textile industry to make breathable clothing."


2

American Dietary material, largely composed of cellulose and other plant structures, that is resistant to human digestive enzymes and promotes healthy digestion.

Example

"Eating whole grains and fresh vegetables is an excellent way to add more fiber to your daily diet."


3

American Essential character, moral strength, or the fundamental structure of a person or thing.

Example

"The ethical scandal tested the moral fiber of the entire corporate organization."

Synonyms
View all synonyms for fiber

Word Nuance & Usage

Spelled 'fiber' in American English, whereas 'fibre' is the standard spelling in British and Commonwealth English.

• Rhymes for fiber

Word Origin & Etymology

From Late Middle English, via Old French from Latin 'fibra', meaning 'fiber, filament, or entrails'.

Usage Trend

Historical frequency of usage in published text.

180019102020

Cite this Entry


Wordmom. (2026). Definition of Fiber. In Wordmom Dictionary. Retrieved Oct 16, 2026, from https://wordmom.com/dictionary/fiber
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