bog oak

noun

noun

Bogwood consisting of oak; an ancient oak tree which has been preserved in a peat bog, with hard black wood.

There is a wealth of carved wood inside: from pulpit to pews, screens to lectern, and a large medieval chest made from a hollowed-out log of bog-oak with a massive lid.1980, AA Book of British Villages, Drive Publications Ltd, page 269, about a church in Lower Peover:

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