what is a nut
A nut is a fruit composed of a hard shell and a seed, which is generally edible. In botany, there is an additional requirement that the shell does not open to release the seed (indehiscent). Peanut is a seed and from a legume type fruit (of the family Fabaceae). 2  Pine nut is the seed of several species of pine (coniferous trees). 3  Pistachio is the seed of a thin-shelled drupe.