From Longman Dictionary of Contemporary Englishgum treeˈgum tree noun [countable] 1 HBPa tall tree which produces a strong-smelling oil that is used in medicine SYN eucalyptus2 → be up a gum tree
Examples from the Corpus
gum tree• The spear-shaped leaves of the gum tree were dappling their faces as the sun moved towards the Andes. 