A building or room where items are cast or molded, particularly in metalworking or manufacturing; a foundry or casting facility.
From 'cast' (to form in a mold) plus 'house' (building). The compound term emerged from industrial and manufacturing terminology to describe facilities dedicated to metal casting and mold work.
Medieval metalworkers had 'casthouses' where they'd pour molten metal into elaborate molds—creating everything from bells to cannons. These were dangerous, exciting places where artistry and physics collided in clouds of smoke and sparks!
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