/ ˌjuːkəˈlɪptəs; NAmE / noun
[ C , U ] ( pl. eu·ca·lyp·tuses or eu·ca·lyp·ti / -taɪ; NAmE /) (also eucaˈlyptus tree , ˈgum tree ) a tall straight tree with leaves that produce an oil with a strong smell, that is used in medicine. There are several types of eucalyptus and they grow especially in Australasia.
—picture at koala
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WORD ORIGIN
modern Latin , from Greek eu well + kaluptos covered (from kaluptein to cover), because the unopened flower is protected by a cap.