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lubricant

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lubricant/ˈluːbrɪkənt/noun
plurallubricants
lubricant
/ˈluːbrɪkənt/
noun
plurallubricants
Learner's definition of LUBRICANT  
[count, noncount]  : a substance (such as grease or oil) that causes something (such as a machine part) to be slippery and to move more smoothly
[count]  : something that makes it easier for people to work or talk with each other
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