1
: a thread or a structure or object resembling a thread: such as
a(1)
: a slender root (as of a grass)
(2)
: an elongated tapering thick-walled plant cell void at maturity that imparts elasticity, flexibility, and tensile strength
c
: a slender and greatly elongated natural or synthetic filament (as of wool, cotton, asbestos, gold, glass, or rayon) typically capable of being spun into yarn
d
: mostly indigestible material in food (such as legumes, whole grains, and vegetables) that stimulates the intestine to peristalsis and promotes elimination of waste from the large intestine : bulk, roughage
dietary fiber
trying to get more fiber in her diet
2
: material made of fibers
especially
: vulcanized fiber
Synonyms
Examples of fiber in a Sentence
It's important to get enough fiber in your diet.
What foods do you recommend as good sources of fiber?
foods that are high in fiber
The fabric is made from a mix of synthetic fibers.
The natural fibers allow the fabric to breathe.
The paper is made from both cotton and wood fiber.
Nylon is a very strong man-made fiber.
The police examined hair and bits of fiber found in the victim's car.
Recent Examples on the Web
Nullarbor fibers have been converted into yarns, fabrics and garments for testing.
—
Jennifer Bringle, Sourcing Journal, 8 July 2024
In a world obsessed with protein, be a fiber devotee.
—Hannah Coates, Vogue, 4 July 2024
Types of Fascia Materials Fascia comes in many different materials, with the most popular being PVC, wood, aluminum, vinyl, and fiber cement.
—Kamron Sanders, Better Homes & Gardens, 3 July 2024
Filled with 80% down and 20% feather fiber for just the right amount of fluff, this down duvet is a high-quality, ethically sourced product that’s suitable for year-round use.
—Blake Bakkila, Architectural Digest, 3 July 2024
See all Example Sentences for fiber 
Jennifer Bringle, Sourcing Journal, 8 July 2024
In a world obsessed with protein, be a fiber devotee.
—Hannah Coates, Vogue, 4 July 2024
Types of Fascia Materials Fascia comes in many different materials, with the most popular being PVC, wood, aluminum, vinyl, and fiber cement.
—Kamron Sanders, Better Homes & Gardens, 3 July 2024
Filled with 80% down and 20% feather fiber for just the right amount of fluff, this down duvet is a high-quality, ethically sourced product that’s suitable for year-round use.
—Blake Bakkila, Architectural Digest, 3 July 2024
See all Example Sentences for fiber
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'fiber.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near fiber
Cite this Entry
“Fiber.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fiber. Accessed 15 Jul. 2024.
Copy CitationKids Definition
fiber
noun
fi·ber
ˈfī-bər 
1
: a thread or a structure or object resembling a thread: as
a
: a slender root (as of a grass)
b
: a long tapering thick-walled plant cell especially of vascular tissue
c
: a muscle cell
e
: a slender and very long natural or synthetic unit of material (as wool, cotton, asbestos, gold, glass, or rayon) usually able to be spun into yarn
f
: mostly indigestible material in food that stimulates the intestine to move its contents along
called also bulk, roughage
2
: material made of fibers
3
: basic toughness : strength
moral fiber
Medical Definition
fiber
noun
fi·ber
variants
or chiefly British fibre
1
2
: mostly indigestible material in food that stimulates the intestine to peristalsis
called also bulk, dietary fiber, roughage
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