A room in a church where priests prepare for services and where religious items and clothes are stored.
From Medieval Latin 'sacristia' (shrine or treasury), from Latin 'sacer' (sacred). The '-ry' or '-ty' ending denotes a place where something is done.
Historically, sacristies were treasure vaults—they held not just religious objects but actual gold, jewels, and valuables, making them the most heavily guarded rooms in medieval towns.
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