snow gum noun1 •(Australia) Any of various eucalypts associated with snowy areas, especially Eucalyptus pauciflora, a flowering shrub of southeastern Australia and Tasmania occurring either side of the snowline; and Eucalyptus coccifera of subalpine Tasmania.A toppled snow gum blocks the track and Jack stands aside while M hacks a step into both sides of the giant log. — 1999 formssnow gums