fiber
B1Neutral to formal, with technical uses.
Definition
Meaning
A thin, thread-like strand, typically of a natural or synthetic material.
A substance with a thread-like structure; dietary material that cannot be digested; strength of character; the basic framework or essence.
Linguistics
Semantic Notes
Primarily a count noun for physical strands, and a mass noun in dietary, moral, and textile contexts. Extended meanings often rely on the metaphor of threads constituting strength or structure.
Dialectal Variation
British vs American Usage
Differences
The British spelling is 'fibre'. The word is used in both varieties, with no significant semantic divergence.
Connotations
Identical connotations between varieties.
Frequency
Similar frequency, with 'fiber optics' more common in US technical contexts and 'fibre optics' in UK contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
fiber + of + N (a fiber of truth)fiber + in + N (fiber in vegetables)made + of/from + fiber (made from natural fibers)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “a fiber of his/her being”
- “lacks moral fiber”
Usage
Context Usage
Business
Refers to materials in manufacturing (e.g., 'carbon fiber components') and telecommunications ('fiber broadband').
Academic
Used in biology (nerve/muscle fibers), materials science, and nutritional studies.
Everyday
Most common in dietary advice ('eat more fiber') and textiles ('cotton is a natural fiber').
Technical
Precise use in optics ('fiber optic cable'), composites ('glass fiber'), and anatomy.
Examples
By Part of Speech
verb
British English
- The material is fibrillated to create softer fibres.
- The process fibres the composite for strength.
American English
- The process fibers the composite for strength.
- New techniques fiber the glass into thin strands.
adverb
British English
- The cloth was woven fibre by fibre. (phrasal)
- The strands align fibre-wise.
American English
- The material is layered fiber by fiber. (phrasal)
- The structure is built fiber-dense.
adjective
British English
- Fibre-reinforced plastic is very strong.
- The new fibre-optic network is faster.
American English
- Fiber-optic cables transmit data using light.
- Fiber-reinforced concrete is used in construction.
Examples
By CEFR Level
- Fruit and vegetables have a lot of fiber.
- Cotton is a soft fiber for making clothes.
- Eating more dietary fiber can improve your digestion.
- The rope was made from strong natural fibers.
- Optical fibers have revolutionized global communications.
- His moral fiber was tested during the crisis.
- The composite's tensile strength derives from the alignment of carbon fibers.
- A single fiber of doubt can unravel an entire argument.
Learning
Memory Aids
Mnemonic
Think of FIBER as the tiny threads that make up a robe (FI-BE-R). Whether in food, cloth, or cables, it's about thin, structural threads.
Conceptual Metaphor
STRUCTURE/STRENGTH IS THREADS; CHARACTER IS TEXTURE (e.g., 'moral fiber').
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid confusing with 'волокно' (fiber as material) and 'клетчатка' (dietary fiber). 'Fiber optics' is 'волоконная оптика', not 'оптическое волокно' for the field.
- Do not translate 'moral fiber' directly; use 'сила характера' or 'стойкость'.
Common Mistakes
- Using 'a fiber' for the uncountable dietary sense (e.g., 'This bread has a good fiber' – incorrect).
- Confusing 'fiber' with 'fabric' (fabric is the woven product).
Practice
Quiz
In which context is 'fiber' used metaphorically?
FAQ
Frequently Asked Questions
There is no difference in meaning. 'Fibre' is the standard British English spelling, while 'fiber' is the standard American English spelling.
It can be both. It is countable when referring to individual strands (e.g., 'a cotton fiber'), and uncountable when referring to the substance as a mass (e.g., 'food rich in fiber', 'moral fiber').
It is an idiomatic expression referring to a person's inner strength, courage, and integrity of character.
In the context of diet, they are synonyms. 'Roughage' is a more informal, older term for dietary fiber, which is the preferred term in nutritional science.