lu·bri·cant 
/ˈlu:brɪkənt/ noun
plural lu·bri·cants /ˈlu:brɪkənt/ noun 1 [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
▪ The car's axles need more lubricant. 2 [count] : something that makes it easier for people to work or talk with each other
▪ using humor as a social lubricant
▪ The car's axles need more lubricant.
▪ using humor as a social lubricant
