Definition of swamp mahogany
1 : a small to medium-sized Australian eucalypt (Eucalyptus robusta) that grows especially on tidal flats and yields a reddish straight-grained damp-resistant lumber
2 : a tropical Australian tree (Tristania suaveolens) that yields a reddish hardwood of firm even texture that is used especially for flooring and is highly resistant to damp and insect attack —called also swamp box
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