: the nut of the oak usually seated in or surrounded by a hard woody cupule of indurated bracts
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Examples of acorn in a Sentence
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Oaks are famous for their acorns, which aren’t just consumed by animals but also by birds such as woodpeckers and jays.—Luke Miller, Better Homes & Gardens, 11 July 2025 There were oak ridges thick with acorns, an abundance of berries and wild cherries, stumps and logs to supply ants, and even hornet nests to knock down.—Carl T. Johnson, Outdoor Life, 2 July 2025 Experts attributed that to oak trees producing a larger-than-expected number of acorns, which allowed larger numbers of deer and other animals that ticks prey on to survive.—Meg Wingerter, Denver Post, 4 July 2025 Moths chew holes in cabbage; squirrels plant acorns in the garlic plot.—Ryan Murphy, IndyStar, 2 July 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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