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noun. someone who participates in long-distance races (especially in marathons).
Sentences with marathoner
1. Noun, singular or mass
A marathoner has less speed than a sprinter, but can run longer than the sprinter because he has more muscular endurance.
2. Proper noun, singular
Star marathoner Grete Waitz religiously skipped a big pasta dinner the night prior to the race, and carb-loaded at breakfast the morning of the race instead.