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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.

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Looking across more than 550 million years of evolutionary history, the team found evidence of the same two-origin arrangement in chickens, zebrafish and even acorn worms.

From Science Daily ● Sep. 21, 2026

An acorn doesn’t become an oak on an assembly line.

From The Wall Street Journal ● Sep. 3, 2026

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

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

Glory drained her tea, and Willie brought down a tree root and took the empty acorn from her hand.

From "The Way to Rio Luna" by Zoraida Cordova

“If we could get them to put a couple of acorns in the ground wherever they go, it could start to have an effect on the local environment,” Bilandzija said.

From Los Angeles Times ● Sep. 19, 2026

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

From Slate ● Aug. 18, 2026

Red and fallow deer eat grasses, leaves and shoots of trees, as well as acorns, sweet chestnuts and horse chestnuts.

From BBC ● Aug. 18, 2026

Which is more interesting: the grand sweep of Russian history or the crunching sound of acorns underfoot?

From The Wall Street Journal ● Jan. 23, 2026

Roz walked up to the tree, picked three large acorns from the ground, and began juggling them in perfect rhythm.

From "The Wild Robot Escapes" by Peter Brown

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