Equipped with, having, or processed through a furnace; subjected to intense heat in a furnace.
From 'furnace' plus the suffix '-ed,' making it an adjective meaning 'having a furnace' or 'processed by a furnace.' Furnace comes from Old French 'fornaise,' from Latin 'fornax' (oven, forge).
When iron or steel gets 'furnaced,' the extreme heat transforms it at a molecular level—what comes out is completely different from what went in, which is basically alchemy!
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