lub·ri·cant
noun/ˈluːbrɪkənt/
/ˈluːbrɪkənt/
(also informal lube
[uncountable, countable]/luːb/
/luːb/
)- a substance, for example oil, that you put on surfaces or parts of a machine so that they move easily and smoothly
润滑剂；润滑油 Word Originearly 19th cent.: from Latin lubricant- ‘making slippery’, from the verb lubricare, from lubricus ‘slippery’.