Ultramarathon definition

ŭltrə-mărə-thŏn
A cross-country footrace longer than a traditional marathon (26 miles, 385 yards).
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A footrace that is longer than a marathon, usually for 30 miles or more.
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A running race over a distance longer than 42.195 km, the length of a marathon.
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Other Word Forms

Noun

Singular:
ultramarathon
Plural:
ultramarathons