English

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

 

heartwood

 noun
noun
BrE BrE//ˈhɑːtwʊd//
 
; NAmE NAmE//ˈhɑːrtwʊd//
 
[uncountable]
 
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the hard older inner layers of the wood of a tree compare sapwood
See the Oxford Advanced American Dictionary entry: heartwood