A fruit or seed pod that develops inside a closed structure and doesn't open naturally to release its seeds.
From Greek 'kleistos' (closed) and 'karpos' (fruit), literally meaning 'closed fruit.' Used in botany to describe fruits with sealed development.
Some plants literally trap their seeds inside closed capsules that never open—their strategy is to let the whole fruit decay or be eaten rather than actively disperse seeds, which is surprisingly effective in certain environments.
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