Plural of bloomery; ancient or medieval furnaces used to extract metal (especially iron) from ore.
From 'bloomery' (from 'bloom' meaning a mass of metal), plural '-ies.' This archaeological/historical term reflects pre-industrial metal-working technology.
Bloomeries were the first metalworking ovens—they worked through sheer heat and labor, producing a spongy mass of iron that blacksmiths had to hammer repeatedly to make it usable.
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