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A cross-country footrace longer than a traditional marathon (26 miles, 385 yards).

ul′tra·mar′a·thon′er n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Athletics (Track & Field)) a race on foot over a distance of more than 26 miles 385 yards (42.195 kilometres)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌʌl trəˈmær əˌθɒn, -θən)

any footrace that is longer than a marathon.
ul`tra•mar′a•thon`er, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
Ultramarathon runner Lowri Morgan TV PICK will guide us through all the event's highlights, with Gareth Roberts commentating during the programme, Marathon Casnewydd 2019, broadcast Monday, 6 May at 9.00pm on S4C.
A MAN completed a 100-mile ultramarathon across a frozen Mongolian lake wearing jeans and brogues after an airline lost his specialist kit.
The 54-day trip saw the adventure junky covering the last 80 miles of his journey in one continuous "Antarctica Ultramarathon" which took 32 hours and 30 minutes.
He also gave the Medalya ng Kasanayan to PO1 Jonathan Pido for winning the Hope 400KM Ultramarathon from Marawi City to Davao City last Aug.
John, who uses his fitness to tackle some truly mammoth challenges - from completing 31 marathons in 31 days to a Spanish ultramarathon in 90 degree heat - is becoming not just a local hero, but a national one too.
The photography section charts Chio-Tian Folk Drums and Arts Troupe's participation in an ultramarathon across the Sahara Desert in 2011.
To be held under the auspices of Dubai Sports Council (DSC) from December 11-15, the Al Marmoom Ultramarathon will be the ultimate measure of athletic endurance, testing physical strength and mental stamina as runners tackle 270km of desert landscape in the Al Marmoom Desert Conservation Reserve.
Seven ultramarathon runners from Vukovar arrived in Janja where they will spend the night and then continue their journey to PotoAari.
I AM furious, but sadly, not surprised at the inaccurate furore that was created over the recent Hardmoors 55 Ultramarathon.
On March 1, ultramarathon runner Evelyn Ang, 44, succumbed to her injuries from a similar incident on December 10 during the Klang City International Marathon.
Vassos said: "Everyone who takes up the challenge of running a 26.2 mile race has a story to tell, and choosing just ten from a field of hundreds of applicants was even more difficult than running an ultramarathon.