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hardboard

noun [U]
 
 
/ˈhɑːd.bɔːd/ US  /ˈhɑːrd.bɔːrd/

Definition

a substance made of very small pieces of wood, mixed with glue and pressed into large, thin, flat piecesBuilding materials
(Definition of hardboard noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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