yellowwood noun6 •Any of the tree genus Cladrastis. •Flindersia xanthoxyla, a tall rainforest tree of Australia. •The Osage orange tree. •Any of the conifer genus Podocarpus. •Sarcomelicope simplicifolia, a small rainforest tree of Australia. •Zanthoxylum brachyacanthum, thorny yellowwood, of Australia formsyellowwoods