ultramarathoner


ul·tra·mar·a·thon

U0011000 (ŭl′trə-măr′ə-thŏn′)n. A cross-country footrace longer than a traditional marathon (26 miles, 385 yards).
ul′tra·mar′a·thon′er n.

ultramarathoner

(ˌʌltrəˈmærəˌθɒnə; ˌʌltrəˈmærəθənə) n (Athletics (Track & Field)) a person who takes part in an ultramarathon