butternut tree but·ter·nutt·ree uncommon noun 1. North American walnut tree having light-brown wood and edible nuts; source of a light-brown dye Synonymsbutternutbutternut treewhite walnutJuglans cinerea Related words Broader terms walnut Parts Juglans Part of butternut WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
