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
Natural fibers and hues of terracotta and maple decorate the property’s 134 rooms, which either face the beach or the hills.
—
Skyli Alvarez, Condé Nast Traveler, 17 May 2026
Specifically, oats contain a soluble fiber called beta-glucan, which is responsible for their cholesterol-lowering effects.
—Kirsten Nunez, Martha Stewart, 17 May 2026
The fiber is produced by heating basalt rock to very high temperatures and drawing the molten material through microscopic nozzles.
—Bojan Stojkovski, Interesting Engineering, 17 May 2026
Chia gel, made by soaking chia seeds in water, is hydrating, low-calorie, and high in fiber, which helps with digestion and gut health.
—Amber J. Tresca, Verywell Health, 16 May 2026
See All Example Sentences for fiber
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Skyli Alvarez, Condé Nast Traveler, 17 May 2026
Specifically, oats contain a soluble fiber called beta-glucan, which is responsible for their cholesterol-lowering effects.
—Kirsten Nunez, Martha Stewart, 17 May 2026
The fiber is produced by heating basalt rock to very high temperatures and drawing the molten material through microscopic nozzles.
—Bojan Stojkovski, Interesting Engineering, 17 May 2026
Chia gel, made by soaking chia seeds in water, is hydrating, low-calorie, and high in fiber, which helps with digestion and gut health.
—Amber J. Tresca, Verywell Health, 16 May 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 21 May. 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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