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acorn

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

noun

  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

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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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.

Landlord Action, a legal service for landlords, and tenants' union Acorn have both reported a rise in Section 21 "no fault" evictions.

From BBC • Apr. 27, 2026

In the UK, a number of carbon capture clusters are under development, including Scotland's Acorn Project and the Viking project off Lincolnshire.

From BBC • Jan. 29, 2026

In a 2023 opinion article in local news outlet the Acorn titled “Keep the Snake closed, it’s quiet,” resident and avid cyclist Todd Bank described how peace and safety abounded in the absence of vehicles.

From Los Angeles Times • Dec. 4, 2025

Ms Andrade said the project also encouraged reusing and recycling kit while supporting employment for people with a disability or health condition at Acorn.

From BBC • Oct. 29, 2025

The sun was beginning to set when Hazel woke to see Acorn listening and sniffing in the silence, between two white-skinned flints.

From "Watership Down: A Novel" by Richard Adams