A large stone or rock, especially one used in a furnace or as part of a kiln in glass-making.
From Dutch steen meaning 'stone' or from Middle Low German steen. It's used in technical contexts, particularly in glassmaking and pottery, where large refractory stones are essential.
In glassblowing and pottery, a steen is the stone that lines furnaces and can withstand temperatures over 2,000 degrees—they're like the unsung heroes of craftsmanship that make beautiful glass possible.
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