mockernut moc·ker·nut uncommon noun 1. smooth-barked North American hickory with 7 to 9 leaflets bearing a hard-shelled edible nut Synonymsmockernut hickoryblack hickorywhite-heart hickorybig-bud hickoryCarya tomentosa Related words Word family mockernut hickory Broader terms hickory Parts Carya WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.