ul·tra·mar·a·thon 
(ŭl′trə-mărə-thŏn′)
(ŭl′trə-mărə-thŏn′)n.
A cross-country footrace longer than a traditional marathon (26 miles, 385 yards).
ul′tra·mara·thon′er n.
- water parting
- water pepper
- water pill
- water pipe
- water pistol
- water plantain
- water polo
- waterpower
- waterproof
- water purslane
- water rat
- water-repellent
- water-resistant
- water right
- Waters
- water sapphire
- waterscape
- water scooter
- water scorpion
- watershed
- water shield
- watershield
- waterside
- water ski
- waterski