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

 

zorbing

 noun
noun
BrE BrE//ˈzɔːbɪŋ//
 
; NAmE NAmE//ˈzɔːrbɪŋ//
 
[uncountable]
 
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a sport in which somebody is put inside a large transparent plastic ball which is then rolled along the ground or down hills Word Origin 1990s: invented word from zorb (the name of the ball used in this activity) + -ing1.
See the Oxford Advanced American Dictionary entry: zorbing