Definitions of red gum:

• noun:   red gum tree of Tasmania
• noun:   very large red gum tree
• noun:   reddish-brown dried gummy exudation from any of several trees of the genus Eucalyptus especially Eucalyptus camaldulensis
• noun:   a North American tree of the genus Liquidambar having prickly spherical fruit clusters and fragrant sap
• noun:   reddish-brown wood and lumber from heartwood of the sweet gum tree used to make furniture