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English definition of “lubricant”

lubricant

noun [C or U] uk   /ˈluː.brɪ.kənt/ (informal lube) us  
a liquid such as oil that is used to make the parts of an engine move easily together, or a substance put on any surface to help it move more easily against another oneLubrication
(Definition of lubricant from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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