ul·tra·mar·a·thon 
(ŭl′trə-mărə-thŏn′)
(ŭl′trə-mărə-thŏn′)n.
A cross-country footrace longer than a traditional marathon (26 miles, 385 yards).
ul′tra·mara·thon′er n.
- Cheltenham
- Chelyabinsk
- Chelyuskin
- chem
- chem-
- chem-
- chemi-
- chemi-
- chemic
- chemical
- chemical abuse
- chemical bond
- chemical dependency
- chemical engineer
- chemical engineering
- chemical fingerprint
- chemically
- chemical peel
- chemical plating
- chemical pregnancy
- chemical reactor
- chemical signature
- chemical toilet
- chemical weapon
- chemiluminescence