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
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
Through the gallery, the Shannons represent Kevin West, whose work has been show at Newfields Art Museum in Indianapolis and the Cincinnati Art Museum, fiber artist Sherry Shine, and collage artist Yolanda Ward.
—
Sheryl Nance-Nash,
ARTnews.com,
6 July 2026
Citrus Fruits Oranges, grapefruits, lemons, limes, and other citrus fruits are full of flavonoids, vitamin C, and soluble fiber, a trio of nutrients that work together to support a healthy heart.
—
Lauren Panoff,
Verywell Health,
6 July 2026
Compared to methods like shredding, this allows recycled fibers to perform like virgin materials.
—
Sarah Jones,
Footwear News,
6 July 2026
Engineers built the aircraft around a modular carbon-fiber structure produced with 3D printing.
—
Aamir Khollam,
Interesting Engineering,
6 July 2026
See All Example Sentences for fiber
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Sheryl Nance-Nash,
ARTnews.com,
6 July 2026
Citrus Fruits Oranges, grapefruits, lemons, limes, and other citrus fruits are full of flavonoids, vitamin C, and soluble fiber, a trio of nutrients that work together to support a healthy heart.
—
Lauren Panoff,
Verywell Health,
6 July 2026
Compared to methods like shredding, this allows recycled fibers to perform like virgin materials.
—
Sarah Jones,
Footwear News,
6 July 2026
Engineers built the aircraft around a modular carbon-fiber structure produced with 3D printing.
—
Aamir Khollam,
Interesting Engineering,
6 July 2026
See All Example Sentences for fiber
Cite this Entry
“Fiber.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fiber. Accessed 7 Jul. 2026.
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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