- hackberry, nettle tree - any of various trees of the genus Celtis having inconspicuous flowers and small berrylike fruits
--1 is a kind of tree
--1 is a member of Celtis, genus Celtis
--1 has particulars:European hackberry, Mediterranean hackberry, Celtis australis; American hackberry, Celtis occidentalis; sugarberry, Celtis laevigata