Botanically pineapple fruit is

Botanically pineapple fruit is sorosis.
Sorosis is a fleshy fruit formed by the consolidation of many flowers with their receptacles, ovaries, etc, as the breadfruit, mulberry and pineapple.
It is a tropical plant with edible fruit, it is the most economically significant plant in the family Bromeliaceae. Pineapples grow as small shrubs; the individual flowers of the unpollinated plant fuse to form multiple fruits., it is a composite type of fruit, thus also called sorosis type.