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ultramarathon

[uhl-truh-mar-uh-thon, -thuh n] /ˌʌl trəˈmær əˌθɒn, -θən/
noun
1.
any footrace of 50 or more miles.
Origin
1975-1980
1975-80; ultra- + marathon
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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