The present participle of carburet; the process of treating metal with carbon to make it harder.
British spelling of carbureting, where the final 't' in carburet doubles before the '-ing' suffix. From carburet, ultimately from Latin carbo (coal).
Carburetting is chemistry in slow motion—you heat metal in a carbon-rich environment and wait for atoms to migrate into the surface. Modern car engines depend on carburetting of their pistons and gears to survive millions of combustion cycles.
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