bog oakn. the wood of oak preserved in a black state in peatbogs, etc.
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bog oak1813
green oak1867
limb-wood1901
1813 M. EdgeworthLet. 24 Oct. in S. H. Romilly Romilly-Edgeworth Lett. (1936) 60 This necklace, and bracelets, are genuine Irish—made of bog-oak—that is, of oak found in our bogs.
1940 L. MacNeiceLast Ditch 9 Stumps of hoary bog-oak.