A percolator is a piece of equipment for making and serving coffee, in which steam passes through crushed coffee beans.
percolator in British English
(ˈpɜːkəˌleɪtə)
noun
a kind of coffeepot in which boiling water is forced up through a tube and filters down through the coffee grounds into a container
percolator in American English
(ˈpɜrkəˌleɪtər)
noun
1.
a thing that percolates
2.
a kind of coffeepot in which the boiling water bubbles up through a tube and filters, through the ground coffee held in a perforated container, back to the bottom of the pot