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

 

hardboard

 noun
noun
BrE BrE//ˈhɑːdbɔːd//
 
; NAmE NAmE//ˈhɑːrdbɔːrd//
 
[uncountable]
 
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a type of stiff board made by crushing very small pieces of wood together into thin sheets
See the Oxford Advanced American Dictionary entry: hardboard