The term compound fruit is not used in technical botanical writing, but is sometimes used when it is not clear which of several fruit types is involved. A compound fruit is "composed of two or more similar parts".^[1]

A compound fruit may be:

• An aggregate fruit, in which one flower contains several separate ovaries, which merge during development.
• A multiple fruit, in which several flowers, each with an ovary, develop into small fruits that are clustered or fused together into a larger fruit.
• A simple fruit formed from a compound ovary.

• 
  A raspberry is an aggregate fruit (shown with a raspberry beetle larva)
• 
  A pineapple is a multiple fruit
• 
  A tomato is a simple fruit derived from a compound ovary

Grapes grow in clusters, but are not compound fruits. Each grape is grown from one ovary in one flower, and each grape remains an independent fruit.

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