A carpel or female reproductive part of a flower, or any leaf-like structure that's part of the fruit-producing system in plants.
From Greek 'karpos' (fruit) + 'phyllon' (leaf). The double 'l' spelling is the standard English form, developing in 19th-century botanical nomenclature.
The carpophyll is basically a plant's way of protecting its babies—these modified leaves wrap around seeds to create the fruit you eat, making every apple or pea pod a cleverly engineered botanical structure.
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