eucalyptus /ˌjuːkəˈlɪptəs/ noun plural eucalyptuses also eucalypti /ˌjuːkəˈlɪpˌtaɪ/ plural eucalyptuses also eucalypti /ˌjuːkəˈlɪpˌtaɪ/ Learner's definition of EUCALYPTUS
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: a type of tree that grows naturally in western Australia and that is grown in other places for the products (such as wood and oil) that it provides桉树