Definition of ultramarathon
: a footrace longer than a marathon
ultramarathonerplay \-ˌthä-nər\ noun
First Known Use of ultramarathon
Learn More about ultramarathon
Britannica.com: Encyclopedia article about ultramarathon
Seen and Heard
What made you want to look up ultramarathon? Please tell us where you read or heard it (including the quote, if possible).