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

 

futon

 noun
noun
BrE BrE//ˈfuːtɒn//
 
; NAmE NAmE//ˈfuːtɑːn//
 
 
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a Japanese mattress, often on a wooden frame, that can be used for sitting on or rolled out to make a bed Word Origin late 19th cent.: Japanese.
See the Oxford Advanced American Dictionary entry: futon