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acorn

American  
[ey-kawrn, ey-kern] / ˈeɪ kɔrn, ˈeɪ kərn /

noun

  • acorns
    plural
  1. the typically ovoid fruit or nut of an oak, enclosed at the base by a cupule.

  2. a finial or knop, as on a piece of furniture, in the form of an acorn.


acorn British  
/ ˈeɪkɔːn /

noun

  1. the fruit of an oak tree, consisting of a smooth thick-walled nut in a woody scaly cuplike base

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Derived Forms

Inflected Forms

Nouns

Etymology

Origin of acorn

before 1000; Middle English acorne (influenced by corn 1 ), replacing akern, Old English æcern, æcren mast, oak-mast; cognate with Old Norse akarn fruit of wild trees, Middle High German ackeran acorn, Gothic akran fruit, yield < Germanic *akrana-; alleged derivation from base of acre is dubious if original reference was to wild trees

Explanation

The nut, or fruit, that grows on oak trees is called an acorn. Chicken Little thought the sky was falling when an acorn fell on his head. Don't make that same mistake. Acorns are a distinctive nut that's often found on forest floors where oak trees grow. They are smooth and greenish, set in a rough brown base that's shaped like a little cup. The acorn is a seed, able to sprout roots if it falls in the right place, eventually growing into a new oak tree. Many animals eat acorns, some stockpiling the nuts for weeks. In Old English, æcern means "nut," from a Germanic origin.

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Vocabulary lists containing acorn

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Fireballs are made when much larger pieces of debris, external - more like the size of a grape or an acorn - pass though the atmosphere.

From BBC Apr. 15, 2026

They put hot rocks into their tightly woven baskets, along with food like acorn mush, to bring the contents to boil.

From Los Angeles Times Jan. 8, 2026

According to scientists, the crisis is being driven by a fast-growing bear population, combined with a falling human population and poor acorn harvest pushing bears to seek food elsewhere.

From Barron's Dec. 24, 2025

All you’ll need are two medium acorn squashes, cooked quinoa or wild rice, fresh or dried cranberries, chopped pecans or walnuts, diced onions, garlic, cinnamon, thyme, olive oil, salt and pepper.

From Salon Nov. 23, 2024

Malcolm went to school, did his homework, fetched and carried at the inn, and read over and over again the secret message in the acorn.

From "The Book of Dust: La Belle Sauvage" by Philip Pullman

One thing LLMs are great at is rapidly finding little acorns within huge blocks of text.

From Slate Aug. 18, 2026

It introduces us to Chinese villagers 10,000 years ago who subsisted on a mélange of acorns, berries, deer and pigs.

From The Wall Street Journal May 1, 2026

Scientists say that bear numbers have grown in Japan in recent years thanks to an abundance of food such as acorns, deer and boars due to a warming climate.

From Barron's Nov. 6, 2025

Why is it a bumper year for acorns?

From BBC Oct. 4, 2025

Passenger pigeons’ diet centered on mast, the collective name for acorns, beechnuts, hazelnuts, chestnuts, and the like; they also really liked maize.

From "1491" by Charles C. Mann

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