A type of carbide or carbon-containing compound, possibly used in metallurgy or materials science.
Likely from 'carb-' (carbon) + '-uran' suffix, possibly relating to uranium compounds or a proprietary material name from early 20th century chemistry.
This appears to be either a very specialized metallurgical term or a now-forgotten proprietary name—it's the kind of word that shows how industrial chemistry created hundreds of terms that disappeared once new materials replaced them.
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