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

 

waterbed

 noun
noun
BrE BrE//ˈwɔːtəbed//
 
; NAmE NAmE//ˈwɔːtərbed//
 
, NAmE//ˈwɑːtərbed//
 
 
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a bed with a rubber or plastic mattress that is filled with water
See the Oxford Advanced American Dictionary entry: waterbed