Plural of columbarium; structures (originally Roman) with many small compartments or recesses, historically used to store funeral urns.
From Latin 'columbarium,' originally meaning 'dovecote' (from 'columba,' dove), because the recesses resembled holes in a dovecote. The term was repurposed for funeral vaults, showing how architectural metaphors transfer between uses.
Romans had this brilliant architectural reuse going—they called funeral vaults 'columbaria' (dovecotes) because the small recesses literally looked like where pigeons would nest, and that agricultural metaphor stuck for centuries.
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