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
Yarn shops and fiber clubs are having a moment, attracting people of all ages who want something meditative, creative, and practical to occupy their minds and hands, away from screens.
—
Alesandra Dubin, Southern Living, 21 Oct. 2025
How to get rid of hemorrhoids Most hemorrhoid complications improve within a week or so through conservative treatments such as adding more fiber to your diet, increasing hydration and using stool softeners to ease bowel movements.
—Daryl Austin, USA Today, 21 Oct. 2025
Both potatoes and sweet potatoes are rich in fiber, antioxidants, and vitamins that support digestion, immunity, and overall health.
—Lindsey Desoto, Health, 21 Oct. 2025
Pumpkin seeds and sunflower seeds are both good sources of dietary fiber, protein, magnesium, and other essential nutrients.
—Brittany Lubeck, Verywell Health, 21 Oct. 2025
See All Example Sentences for fiber
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Alesandra Dubin, Southern Living, 21 Oct. 2025
How to get rid of hemorrhoids Most hemorrhoid complications improve within a week or so through conservative treatments such as adding more fiber to your diet, increasing hydration and using stool softeners to ease bowel movements.
—Daryl Austin, USA Today, 21 Oct. 2025
Both potatoes and sweet potatoes are rich in fiber, antioxidants, and vitamins that support digestion, immunity, and overall health.
—Lindsey Desoto, Health, 21 Oct. 2025
Pumpkin seeds and sunflower seeds are both good sources of dietary fiber, protein, magnesium, and other essential nutrients.
—Brittany Lubeck, Verywell Health, 21 Oct. 2025
See All Example Sentences for fiber
Cite this Entry
“Fiber.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fiber. Accessed 23 Oct. 2025.
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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