ultramarathon

[ uhl-truh-mar-uh-thon, -thuhn ]
/ ˌʌl trəˈmær əˌθɒn, -θən /

noun

any footrace of 50 or more miles.

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Origin of ultramarathon

First recorded in 1975–80; ultra- + marathon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for ultramarathon