Definition of "upgrader" []

• One who, or that which, upgrades. (noun)
• A facility that upgrades bitumen into synthetic crude oil. (noun)

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• "Under the plan, heavy Venezuelan crude will first be processed at a so-called upgrader unit in Venezuela, to be built by Total, then shipped to China to be made into gasoline and diesel for the domestic market."
• "One, "synthetic crude," has passed through a sort of pre-refinery, called an upgrader, to transform it into a lighter substance that contains far fewer impurities."
• "Pictures showed an enormous ball of fire searing the sky above the upgrader, which is the part of the plant that was engulfed in the blaze."