A fruit that develops from multiple separate carpels within a single flower, where each carpel becomes an individual fruitlet but they remain clustered together. Raspberries and blackberries are familiar examples.
From Latin 'aggregatus' meaning 'gathered together' + 'fructus' (fruit). The term emerged in botanical classification systems of the 19th century to distinguish fruits formed from multiple carpels in one flower from those formed from multiple flowers.
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