macadamia tree ma·ca·da·miatree uncommon noun 1. any tree of the genus Macadamia Synonymsmacadamiamacadamia tree Related words Broader terms nut tree Narrower terms Macadamia integrifoliamacadamia nutQueensland nut Parts genus Macadamia WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.