Definition of lubricant noun from the Oxford Advanced Learner's Dictionary

 

lubricant

 noun
noun
BrE BrE//ˈluːbrɪkənt//
 
; NAmE NAmE//ˈluːbrɪkənt//
 
(informal lube
BrE BrE//luːb//
 
; NAmE NAmE//luːb//
 
)
[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 Word Origin early 19th cent.: from Latin lubricant- ‘making slippery’, from the verb lubricare, from lubricus ‘slippery’.
See the Oxford Advanced American Dictionary entry: lubricant