An aggregate fruit is one which develops from
Aggregate fruits (etaerio) are those fruits that develop from the multicarpellary apocarpus gynoecium (ovary). Individual carpel or pistil develops into fruitlet.
In contrast, a simple fruit develops from one ovary. Aggregate fruit may also be called as accessory fruits in which part of the flower other than the ovary becomes fleshy and form part of the fruit, e.g. raspberry, etc.