n. Any tree that exudes a gum, such as: (a) The black gum (Nyssa multiflora), one of the largest trees of the Southern States, bearing a small blue fruit, the favorite food of the opossum. Most of the large trees become hollow. (b) A tree of the genus Eucalyptus; a eucalypt. See Eucalpytus. (c) The sweet gum tree of the United States (Liquidambar styraciflua), a large and beautiful tree with pointedly lobed leaves and woody burlike fruit. It exudes an aromatic terebinthine juice. (d) The sour gum tree. [ 1913 Webster ]