Definition of "ultrarunners" [ultrarunners]

• Plural form of ultrarunner. (noun)

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• "The magazine's current cover story tells the secrets of "ultrarunners" who "outpace younger competitors"; the poster boy is Roy Pirrung, who at the age of 58 ran nearly 140 straight miles for a second-place finish in last year's USA Track and Field 24-Hour Championships."
• "Palmiero-Winters has a schedule that could overwhelm the most hard-core ultrarunners."
• "Many ultrarunners train by doing 20 - to 50-mile runs on back-to-back days."