fiber

noun
fi·​ber | \ ˈfī-bər How to pronounce fiber (audio) \

Definition of fiber

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
b(1) : a strand of nerve tissue : axon, dendrite
(2) : one of the filaments composing most of the intercellular matrix of connective tissue
(3) : one of the elongated contractile cells of muscle tissue
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
3a : an element that gives texture or substance
b : basic toughness : strength, fortitude
c : essential structure or character the very fiber of a person's being

Keep scrolling for more

Other Words from fiber

fibered \ ˈfī-​bərd How to pronounce fibered (audio) \ adjective

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.
See More

Recent Examples on the Web

One cup provides 100 calories, 9 grams of healthful fat, 4 grams of plant protein, and just 4 grams of carb with 2 from fiber, along with 6% of your daily calcium needs and 4% for iron. Cynthia Sass, Mph, Health.com, "5 Trader Joe's New Products to Try This Fall," 17 Sep. 2019 Other possibilities, the hospital said, include constriction ring syndrome -- when fibers from the amniotic sac wrap themselves around a fetus, causing deformities -- or the umbilical cord becoming wrapped around a fetus' limbs. Matthew Robinson, CNN, "Babies born with deformed hands spark investigation in Germany," 16 Sep. 2019 The company has a few designs to allow custom facades, including a fiber cement surface that can be painted to match the main house. Louis Hansen, The Mercury News, "A streamlined future for the pre-fab granny flat," 12 Sep. 2019 During their formative years, Joe made sure that their moral fibers were enriched by both Archie Bunker and Benny Hill. courant.com, "Joseph Heller," 12 Sep. 2019 Well, there were a few leisure suits, but they were draped on the bodies of men with disappointingly strong moral fiber. David Harsanyi, National Review, "Criminal Charisma," 12 Sep. 2019 The instrument has 5000 fibers attached to its 0.8-meter-wide focal plane. Daniel Clery, Science | AAAS, "Robot detector to map cosmos for clues to dark energy," 11 Sep. 2019 During their formative years, Joe made sure that their moral fibers were enriched by both Archie Bunker and Benny Hill. Joelle Goldstein, PEOPLE.com, "82-Year-Old Prankster Dies and His Family Gives Him a Hilarious Obituary to Send Him Off," 11 Sep. 2019 Originally a Korean beauty trend, sheet masks have made their way to the US, where fans (including a celeb cult following) love the way the wet paper face masks, often made of bamboo, fiber or cotton, deliver soothing ingredients to the skin. Nikhita Mahtani, CNN Underscored, "10 top-rated sheet masks you can buy on Amazon right now," 11 Sep. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fiber.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of fiber

1607, in the meaning defined at sense 1

History and Etymology for fiber

Middle French fibre, from Latin fibra

Keep scrolling for more

Learn More about fiber

Dictionary Entries near fiber

fiat money

fib

fibbery

fiber

fiberboard

fiber box

fiber can

Statistics for fiber

Last Updated

14 Oct 2019

Look-up Popularity

Time Traveler for fiber

The first known use of fiber was in 1607

See more words from the same year

Keep scrolling for more

More Definitions for fiber

fiber

noun

English Language Learners Definition of fiber

: plant material that cannot be digested but that helps you to digest other food
: a thin thread of natural or artificial material that can be used to make cloth, paper, etc.
: material (such as cloth) that is made from thin threads : something made of fibers

fiber

noun
fi·​ber | \ ˈfī-bər How to pronounce fiber (audio) \

Kids Definition of fiber

1 : a thread or a structure or object resembling a thread
2 : plant material that cannot be digested

fiber

noun
fi·​ber
variants: or chiefly British fibre \ ˈfī-​bər How to pronounce fibre (audio) \

Medical Definition of fiber

1 : a thread or a threadlike structure or object: as
a : a strand of nerve tissue : axon, dendrite
b : one of the filaments composing most of the intercellular matrix of connective tissue
c : one of the elongated contractile cells of muscle tissue
2 : mostly indigestible material in food that stimulates the intestine to peristalsis

called also bulk, dietary fiber, roughage

Keep scrolling for more

More from Merriam-Webster on fiber

Rhyming Dictionary: Words that rhyme with fiber

Thesaurus: All synonyms and antonyms for fiber

Spanish Central: Translation of fiber

Nglish: Translation of fiber for Spanish Speakers

Britannica English: Translation of fiber for Arabic Speakers

Britannica.com: Encyclopedia article about fiber

Comments on fiber

What made you want to look up fiber? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a bell tower

Get Word of the Day daily email!

Test Your Vocabulary

Where in the World? A Quiz

  • peter bruegel tower of babel painting
  • What language does pajama come from?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!