: the nut of the oak usually seated in or surrounded by a hard woody cupule of indurated bracts

Illustration of acorn

Illustration of acorn

Examples of acorn in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Each has a tag that lists its origin: acorns collected in Bergen County, New Jersey, or in the Bronx or Westchester, then sprouted at a Forest Service facility and transported here. Robert Sullivan, Curbed, 9 June 2025 Why Are Deer Damaging My Garden? Deer will eat whatever’s seasonally abundant and available, so their diets change throughout the year to include things such as fruit, vegetables, mushrooms, grass, acorns, and crops. Arricca Elin Sansone, Southern Living, 7 June 2025 The bears have a habit of coming into Heathrow in the fall when the acorns fall and then leave. Letters To The Editor, The Orlando Sentinel, 18 May 2025 Members of the Junior Ladies Garden Club of Athens came to the rescue, harvesting acorns to grow a strong replacement. Jessica Farthing, Southern Living, 2 Jan. 2025 See All Example Sentences for acorn

Word History

Etymology

Middle English akorn, akkorn (partially assimilated to corn "kernel, corn entry 1"), hakerne, accherne, accharne, going back to Old English æcern, going back to Germanic *akrana- (whence also Middle High German ackeran "tree nuts," Old Norse akarn, Gothic akran "fruit, produce"); akin to Old Irish írne "sloe, kernel," Welsh eirin "plums, sloes," aeron "fruits, berries," going back to Celtic *agrinyo-, *agranyo-; perhaps further akin to a Balto-Slavic word with an initial long vowel (Old Church Slavic agoda "fruit," Polish jagoda "berry," Lithuanian úoga)

Note: Taken to be a derivative of Indo-European *h2eǵros "uncultivated field, pasture" (see acre), though this would seem to exclude the Balto-Slavic etymon, which lacks the suffix, from consideration. It is also not clear if fields, uncultivated or not, are the source of wild tree nuts.

First Known Use

before the 12th century, in the meaning defined above

Time Traveler
The first known use of acorn was before the 12th century

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Cite this Entry

“Acorn.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/acorn. Accessed 19 Jun. 2025.

Kids Definition

: the roundish one-seeded thin-shelled nut of an oak tree usually having a woody cap

More from Merriam-Webster on acorn

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