Etymology
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eucalyptus (n.)

evergreen genus of Australia, 1789, from Modern Latin, coined 1788 by French botanist Charles Louis L'héritier de Brutelle (1746-1800) from Greek eu "well" (see eu-) + kalyptos "covered" (from PIE root *kel- (1) "to cover, conceal, save"); so called for the covering on the bud.

updated on October 13, 2017

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Definitions of eucalyptus from WordNet

eucalyptus (n.)
wood of any of various eucalyptus trees valued as timber;
eucalyptus (n.)
a tree of the genus Eucalyptus;
Synonyms: eucalypt / eucalyptus tree
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.