mar·a·thon·er 
(mărə-thŏn′ər)
(mărə-thŏn′ər)n.
One that participates in a marathon, especially a marathon runner.
mara·thon′ing n.
- antibacterial
- antiballistic missile
- antibaryon
- Antibes
- antibiosis
- antibiotic
- antibiotically
- antibody
- antibusiness
- antic
- antically
- anticancer
- anticancerous
- anticatalyst
- anticathode
- antichlor
- anti-choice
- anticholinergic
- anticholinesterase
- antichrist
- anticipant
- anticipatable
- anticipate
- anticipation
- anticipative