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
The main difference between eating a piece of fruit and drinking fruit juice is that the latter usually removes the fruit's fiber, which is what helps slow down the body's blood sugar response, Sharp notes.
—
Hannah Yasharoff, USA TODAY, 14 Apr. 2024
Eating too much fiber can aggravate symptoms of Crohn's disease.2
Find examples below from various food groups to add to your diet if you've been diagnosed with Crohn's disease.
—Toby Amidor, Rd, Health, 14 Apr. 2024
Meanwhile, insoluble fiber can be found in food items like wheat bran and vegetables and can help to both add bulk to stool and promote healthy bowel function.
—Marilyn La Jeunesse, Glamour, 12 Apr. 2024
Work gloves made from specialized cut-resistant fibers, like Kevlar and Dyneema, are the strongest available.
—Rachel Ahrnsen, Better Homes & Gardens, 11 Apr. 2024
Taking too much fiber could lead to gas and bloating.
—Erika Prouty, Verywell Health, 11 Apr. 2024
The fiber contained in avocados will help promote digestion to keep your gut bacteria healthy.
—Sina Petri, Vogue, 5 Apr. 2024
Prebiotic fibers nourish beneficial bacteria in your dog's gut, while probiotics support healthy bacteria and enhance digestion.
—Edward Munch, Discover Magazine, 3 Apr. 2024
Resistance exercise also stimulates a cascade of growth signals that prompt muscle fibers to reinforce themselves, capillaries to expand the muscle’s blood supply, and DNA to make more proteins.
—Donavyn Coffey, TIME, 1 Apr. 2024
Hannah Yasharoff, USA TODAY, 14 Apr. 2024
Eating too much fiber can aggravate symptoms of Crohn's disease.2
Find examples below from various food groups to add to your diet if you've been diagnosed with Crohn's disease.
—Toby Amidor, Rd, Health, 14 Apr. 2024
Meanwhile, insoluble fiber can be found in food items like wheat bran and vegetables and can help to both add bulk to stool and promote healthy bowel function.
—Marilyn La Jeunesse, Glamour, 12 Apr. 2024
Work gloves made from specialized cut-resistant fibers, like Kevlar and Dyneema, are the strongest available.
—Rachel Ahrnsen, Better Homes & Gardens, 11 Apr. 2024
Taking too much fiber could lead to gas and bloating.
—Erika Prouty, Verywell Health, 11 Apr. 2024
The fiber contained in avocados will help promote digestion to keep your gut bacteria healthy.
—Sina Petri, Vogue, 5 Apr. 2024
Prebiotic fibers nourish beneficial bacteria in your dog's gut, while probiotics support healthy bacteria and enhance digestion.
—Edward Munch, Discover Magazine, 3 Apr. 2024
Resistance exercise also stimulates a cascade of growth signals that prompt muscle fibers to reinforce themselves, capillaries to expand the muscle’s blood supply, and DNA to make more proteins.
—Donavyn Coffey, TIME, 1 Apr. 2024
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 19 Apr. 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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