Botanically, a type of single-seeded fruit in which the pericarp enclosing the seed is a hard woody shell. In common usage the term is used loosely for any hard, oil-rich kernel. Of those commonly eaten, only hazel, filbert, and chestnut are strictly nuts. Walnuts, pecans, almonds, and coconuts are really drupes. Brazil nuts, pistachios, macadamias, and cashews are really seeds with a hard shell derived from the testa rather than the pericarp.
    

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Richland pure foods / Brewhurst Health Food Supplies.

Marrons d'Inde.

The FRESH Network : Fruitarian & Raw Energy Support & Help : for intuitive raw food eating / Susie Miller.

Common beech (Fagus sylvatica): stem with flowers and nut and floral segments. Coloured lithograph after M. A. Burnett, c. 1843.

Pecans USA : America's flavourite nut / U.S.A. Pecan Press Office.

A hazel or filbert plant (Corylus species): fruiting branch with separate nut and leaf. Watercolour.

Living with nut allergies / Karen Evennett.

Milk, soya, nut and rice drinks : a comparison / National Dairy Council.

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Pecans USA : America's flavourite nut / U.S.A. Pecan Press Office.

A hazel or filbert plant (Corylus species): fruiting branch with separate nut and leaf. Watercolour.

The FRESH Network : Fruitarian & Raw Energy Support & Help : for intuitive raw food eating / Susie Miller.

Living with nut allergies / Karen Evennett.

Milk, soya, nut and rice drinks : a comparison / National Dairy Council.