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ultra-marathon
ultra-marathon n.
Brit. 
/ˌʌltrəˈmarəθ(ə)n/
, /ˌʌltrəˈmarəθ(ə)n/U.S. /ˌəltrəˈmɛrəˌθɑn/
/ˌəltrəˈmɛrəˌθɑn/ΚΠ
1977 J. F. Fixx Compl. Bk. Running xxiv. 268 Corbitt knows as much about long races—ultramarathons, runners call them—as anyone alive.
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