1. (noun)mockernut, mockernut hickory, black hickory, white-heart hickory, big-bud hickory, Carya tomentosa smooth-barked North American hickory with 7 to 9 leaflets bearing a hard-shelled edible nut Synonyms: white-heart hickory, black walnut, mockernut, mockernut hickory, pignut hickory, brown hickory, black hickory, pignut, black walnut tree, big-bud hickory