[Gk.] An Australian evergreen tree like the myrtle, which grows to a great height, and yields resins, oils, tars, and tannin. The leaves are rigid, with one edge turned to the zenith. They are called gum-trees. The timber is valuable. The Tasmanian cider-tree is a eucalyptus, and yields a cider like sap in spring. A eucalyptus tree in Cape Otway Range, Australia, is 415 feet high. These trees have been widely transplanted and are thought to be of value in malarious districts, as in the Roman Campagna.