Home › Words › U › ultrarunnerultrarunnerultrarunner means A runner in an ultramarathon.Among words judged in Lexicurio's Arena, ultrarunner ranks #25,601 of 42,747 for Qualifying.EtymologyFrom ultra- + runner.nounA runner in an ultramarathon.Definitions & examples from Wiktionary (CC BY-SA 3.0).