sweet-gum-tree; a genus of the polyandria order, belonging to the monocotyledon class of plants. There are two species, both of them beautiful deciduous trees, growing 30 or 40 feet high, forming fine pyramidal heads; adorned with large angular and oblong leaves, and monoeious, apetalous, saffron-coloured flowers; and producing a liquid, transparent, gummy substance, of great fragrance. They may be propagated either by seed or layers in the full ground. The seeds must be procured from America, where these trees are natives.