/ˌju:kəˈlɪptəs ||; ˌjukəˈlɪptəs/noun [C] (plural eucalyptuses or eucalypti /-taɪ ||; -taɪ/) a tall straight tree that grows especially in Australia and Asia. Its leaves produce an oil with a strong smell, that is used in medicine. 桉树（尤产于澳大利亚及亚洲，桉叶油可制药） ☞picture at marsupial 见 marsupial 插图