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Definition of lubricator : 1. A contrivance, as an oil cup, for supplying a lubricant to machinery.
2. One who, or that which, lubricates.

Synonyms:

lubricant, lube, lubricating substance

Usage examples:

• " Roy, you get the Butterfly out and fill the lubricator tank. - "The Girl Aviators and the Phantom Airship", Margaret Burnham.
• Perhaps he was not to be greatly credited for that, inasmuch as happiness is a great lubricator of the social wheels. - "The Gold of Chickaree", Susan Warner.