Definition of "restrictor" [restrictor]

• Anything that restricts (noun)

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• "The restrictor is usually made of soft white plastic."
• "He and Michael have been real strong in restrictor plate races."
• "Draft Guinness, which is impregnated with a blend of carbon dioxide and nitrogen and run through a device called a restrictor plate to produce that creamy, small-bubble foam, requires its own set of skills."