| Noun | 1. | hackberry - any of various trees of the genus Celtis having inconspicuous flowers and small berrylike fruitsCeltis, genus Celtis - large genus of trees and shrubs with berrylike fruit Celtis australis, European hackberry, Mediterranean hackberry - bright green deciduous shade tree of southern Europe American hackberry, Celtis occidentalis - large deciduous shade tree of southern United States with small deep purple berries Celtis laevigata, sugarberry - deciduous shade tree with small black berries; southern United States; yields soft yellowish wood tree - a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms |
| 2. | hackberry - small edible dark purple to black berry with large pits; southern United States berry - any of numerous small and pulpy edible fruits; used as desserts or in making jams and jellies and preserves |