Definition of eucalyptus noun from the Oxford Advanced American Dictionary

 

eucalyptus

 noun
noun
NAmE//ˌyukəˈlɪptəs//
 
(pl. eucalyptuses or eucalypti
NAmE//ˌyukəˈlɪptaɪ//
 
)
[countable, uncountable](also eucalyptus tree, gum tree [countable])
 
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a tall straight tree with leaves that produce an oil with a strong smell that is used in medicine. There are several types of eucalyptuses and they grow especially in Australasia. Koalas eat very few things besides eucalyptus leaves.
See the Oxford Advanced Learner's Dictionary entry: eucalyptus