Tall fast-growing timber tree with leaves containing a medicinal oil; young leaves are bluish; SYN. fever tree, Eucalyptus globulus.
Either of two Australian trees: Tasmanian blue gum Eucalyptus globulus of the myrtle family, with bluish bark, a chief source of eucalyptus oil; or Sydney blue gum E. saligna, a tall, straight tree. The former is cultivated extensively in California and has also been planted in South America, India, parts of Africa, and S Europe. blue gum