marathoner
🇺🇸
/ˈmærəθɑːnər/
🇬🇧
/ˈmærəθənə(r)/
A person who participates in a marathon race, which is a long-distance running event with an official distance of 42.195 kilometers (26.219 miles).
After months of training, she became a confident marathoner and completed her first race.