A person who operates or tends to a furnace, maintaining its heat and fuel levels.
From furnace (Middle English, from Old French fornaise, from Latin fornax meaning 'oven') + the agent suffix -er, creating a term for someone who works with furnaces.
Medieval castle workers called furnacers were crucial to warfare—they had to keep blacksmith furnaces hot enough to forge weapons and armor, making them skilled craftspeople whose hands were literally shaped by extreme heat.
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