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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Filbert

Filbert, a flavorful nut with a brittle shell. Most cultivated filberts are obtained from hybrids of the European hazel, giant hazel, and cobnut trees.