black walnut tree black·wal·nutt·ree uncommon noun 1. North American walnut tree with hard dark wood and edible nut Synonymsblack walnutblack walnut treeblack hickoryJuglans nigra Related words Broader terms walnut Parts Juglans Part of black walnut WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
