In foundry work, a specialized core or mold component used in casting to create hollow spaces or complex internal structures in metal castings.
From core (the internal mold) plus rebel, possibly from Old English or a dialectal term meaning a support or backing piece. The term is specialized to the casting and foundry industries.
Corebels are silent heroes of manufacturing—they're the hidden molds inside castings that you never see but that make airplane engines and car blocks possible by creating the perfect hollow spaces for cooling and strength.
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