Definition of biathlon noun from the Oxford Advanced American Dictionary

 

biathlon

 noun
noun
NAmE//baɪˈæθlɑn//
 
, NAmE//baɪˈæθlən//
 
 
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a sporting event that combines cross-country skiing and rifle shooting compare decathlon, heptathlon, pentathlon, tetrathlon, triathlon
See the Oxford Advanced Learner's Dictionary entry: biathlon