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

 

seasickness

 noun
noun
BrE BrE//ˈsiːsɪknəs//
 
; NAmE NAmE//ˈsiːsɪknəs//
 
[uncountable]
 
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a feeling that you are going to vomit (1) caused by travelling on a boat or ship to suffer from seasickness