[uhl-truh-mar-uh-thon, -thuh n]
any footrace of 50 or more miles.
Origin of ultramarathon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for ultramarathon
Contemporary Examples of ultramarathon
If snow is more your thing, the 6633 Extreme Winter Ultramarathon runs 350 miles across the Arctic Circle.Now That Everest Is Closed, Check Out These Other Extreme Adventures
May 8, 2014