Definition: U-V-A X-7 refers to a type of oil that contains 7% hydrogen gas, or a specific type of gasoline with hydrogen in its mixtures. This term describes a specific chemical compound or product. It's not mentioned specifically as a word, but it might have been used in Greek or Latin contexts. For instance, "uvax" was one such term from the ancient Greeks and Romans that could mean something resembling "oil," but without specifying what substance it referred to.
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