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DEF - Powdered graphite or other carbonaceous matter used by foundrymen as a powder or wash in the inner surfaces of a mould, to protect the sand and improve the finish of the casting
N.B.: I assume you are still working on vehicles? *cinética* = constant velocity. The whole word would be *homocinética* (CV joint). Our Vanagon's CV joint went out in Mexico, and we had a dickens of a time locating the right Mexican term, so we could tell the VW people in Xalapa what was wrong.