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
Re-imagining the Wheel Due to their size and the presence of whorls, the pebbles were likely used as an early version of a spinning wheel to gather up fibers like wool or flax and transform it into yarn.
—
Paul Smaglik, Discover Magazine, 13 Nov. 2024
Cotton fibers are hollow inside, and carry a slight negative charge.
—Wes Siler, Outside Online, 6 Nov. 2024
The security of the watermark comes from it being embedded into the fibers of the ballot paper during the milling process, as opposed to it simply being printed onto the paper.
—Thomas G. Moukawsher, Newsweek, 5 Nov. 2024
Eat plenty of fiber and nutritious food to promote healthy bowel movements and reduce straining, which could worsen pain.
—Michelle Pugle, Verywell Health, 4 Nov. 2024
See all Example Sentences for fiber 
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Paul Smaglik, Discover Magazine, 13 Nov. 2024
Cotton fibers are hollow inside, and carry a slight negative charge.
—Wes Siler, Outside Online, 6 Nov. 2024
The security of the watermark comes from it being embedded into the fibers of the ballot paper during the milling process, as opposed to it simply being printed onto the paper.
—Thomas G. Moukawsher, Newsweek, 5 Nov. 2024
Eat plenty of fiber and nutritious food to promote healthy bowel movements and reduce straining, which could worsen pain.
—Michelle Pugle, Verywell Health, 4 Nov. 2024
See all Example Sentences for fiber
Dictionary Entries Near fiber
Cite this Entry
“Fiber.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fiber. Accessed 22 Nov. 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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