10 letters · 15 points in Scrabble
noun someone who participates in long-distance races (especially in marathons)
originEtymology tree English marathon Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English marathoner From marathon + -er.
Etymology from Wiktionary, CC BY-SA 3.0