Definition of motocross noun from the Oxford Advanced Learner's Dictionary

 

motocross

 noun
noun
BrE BrE//ˈməʊtəʊkrɒs//
 
; NAmE NAmE//ˈmoʊtoʊkrɔːs//
 
, NAmE//ˈmoʊtoʊkrɑːs//
 
(British English also scrambling)[uncountable]
 
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the sport of racing motorcycles over rough ground Word Origin 1950s: abbreviation of motor + cross.
See the Oxford Advanced American Dictionary entry: motocross