Blue gum Meaning, Definition & Usage

  1. noun tall fast-growing timber tree with leaves containing a medicinal oil; young leaves are bluish
    fever tree; Eucalyptus globulus.

WordNet

Definitions
  1. an Australian myrtaceous tree (Eucalyptus globulus), of the loftiest proportions, now cultivated in tropical and warm temperate regions for its timber, and as a protection against malaria. The essential oil is beginning to be used in medicine. The timber is very useful. See Eucalyptus.

Webster 1913