/,ju:kə'lɪptəs; ,jukə`lɪptəs/
n (pl ~es or -lypti / -5lIptaI; -`lIptaI/)
1 (also euca`lyptus tree) any of several types of tall evergreen trees (including the Australian gum-tree), from which oil, timber and gum are obtained 桉树属.
2 (also euca`lyptus oil) [U] oil obtained from its leaves, used as a treatment for colds 桉树油（用以治疗感冒）.

n [U and C]
[Date: 1800-1900; Language: Modern Latin;Origin: eu- 'well, good' (from Greek ey, eu 'good') + Greek kalyptos 'covered'; from the covering on the tree's buds]
a tall tree that produces an oil with a strong smell, used in medicines