What nuts are actually seeds?
Nuts are defined as a simple, dry fruit with one seed (very occasionally two) in which the seed case wall becomes very hard at maturity. True nuts include pecan, sweet chestnut, beech, acorns, hazel, hornbeam and alder. Peanuts, almonds, pistachios, cashews, horse chestnuts and pine nuts are not nuts.
Are nuts just seeds?
A nut is a fruit composed of an inedible hard shell and a seed, which is generally edible. In general usage, a wide variety of dried seeds are called nuts, but in a botanical context "nut" implies that the shell does not open to release the seed (indehiscent).
What is a true nut?
A true nut, botanically speaking, is a hard-shelled pod that contains both the fruit and seed of the plant, where the fruit does not open to release the seed to the world. Some examples of botanical nuts are chestnuts, hazelnuts, and acorns.
Is a pistachio a nut or a seed?
Although known as a nut, the fruit of the pistachio is botanically a drupe, the edible portion of which is the seed.