black hickory n smooth-barked North American hickory with 7 to 9 leaflets bearing a hard-shelled edible nut n an American hickory tree having bitter nuts n North American walnut tree with hard dark wood and edible nut Synonym(s) mockernut mockernut hickory white-heart hickory big-bud hickory Carya tomentosa pignut pignut hickory brown hickory Carya glabra black walnut black walnut tree Juglans nigra