percolatorPronunciation: /ˈpəːkəleɪtə/Translate percolator | into French | into German | into Italian | into Spanish Definition of percolator noun a machine for making coffee, consisting of a pot in which boiling water is circulated through a small chamber that holds the ground beans. Spelling helpThe ending of percolator is spelled -or.percolator in other Oxford dictionaries Definition of percolator in the US English dictionary