noun
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