A device or substance used to add carbon to metals, or one who performs the carbureting process.
From carburet + -er (agent noun suffix). British spelling variant of carburizer, following convention where '-et' becomes '-etter' when adding the agent suffix.
Industrial carburetters were crucial inventions—they allowed consistent, controlled carbon-hardening of metal parts, which made the Industrial Revolution possible by producing reliable machinery that wouldn't wear out.
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