The immature members of a colony collectively, including eggs, nymphs, larvae, and pupae: In the strict sense, eggs and pupae are not members of the society, but they are nevertheless referred to as part of the brood.

A specially-prepared space or structure in the nests of bees and wasps: Food can be stored in a brood cell, and eggs are laid in such a cell, and the larvae can complete their development in it.