- 1. ultrarun (plural ultraruns) An ultramarathon. Source: ecdict
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ultrarun
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ultramodernultramodernityultramontaneultramontanesultramontanismultramontanistultramundaneultranationalismultranationalisticultraredultrasonicultrasonic flaw detectorultraultra light railultra viresultra-ultra-leftistsultra-lightweight concreteultra-nationalistsultra-radicalsultra-rightistsUltracefultracentrifugation
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