oilEnglishOxford American Thesaurusoil noun make sure the car has enough oil: lubricant, lubrication, grease; fuel, petroleum; North American, informal black gold; North American, & Australian, informal lube.verb I'll oil that gate for you tomorrow: lubricate, grease; North American, & Australian, informal lube.word linksoiloleo- related prefix, as in oleochemical, oleograph