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Definition of lubricant noun from the Oxford Advanced American Dictionary

 

lubricant

 noun
noun
NAmE//ˈlubrəkənt//
 
(informal lube
NAmE//lub//
 
) [uncountable, countable]
 
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a substance, for example oil, that you put on surfaces or parts of a machine so that they move easily and smoothly
See lubricant in the Oxford Advanced Learner's Dictionary
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