Chestnut, a nut-bearing hardwood tree related to the oak and beech. Its burlike fruit contains one to three nuts, also called chestnuts, that resemble large acorns flattened on one side.
Nuts are hard, dry, single-seeded fruits which do not open at maturity. Nuts provide nourishment for any animals that are able to open the shells. Many fruits are called nuts, even though biologists would not classify them as such.
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