A large tropical fruit with a hard shell that grows on a vine, native to Central and South America, sometimes used for decoration or food.
From Spanish 'cassabana' or Portuguese 'caçabana,' possibly from Tupi language of Brazil. The word traveled through colonial trade routes to describe this climbing plant's fruit that was unfamiliar to Europeans.
The cassabanana is so hard-shelled and distinctive-looking that Spanish colonists gave it its own unique name rather than trying to fit it into existing fruit categories—a linguistic marker of how explorers encountered completely novel plants in the Americas.
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