The Book of Rites mentions pickled vegetables among the ritual offerings.
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history
菹 is archaic and not used independently in modern Chinese. Its 'pickled vegetable' sense is now 腌菜; the rarer 'marshland' sense is now 沼泽. It also named a gruesome ancient punishment, mincing the body (菹醢).
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Classical only — ritual and historical texts, not modern speech.