Gŭm'-tree, n.

n. 1. (Bot.) (a.) The black gum (Nyssa multiflora), one of the largest trees of the Southern States. Its small blue fruit is the favorite food of the opossum. Most of the large trees become hollow. (b.) A tree of the genus Eucalyptus, found in Australia, having a straight, branchless stem from one to two hundred feet in height. 2. A hollow tree. [Southern U. S.] ☞ From the use of sections of gum-trees for bee-hives, a bee-hive is sometimes called a bee-gum in the Southern States.