noun, plural eucalypti [yoo-kuh-lip-tahy] , eucalyptuses.
any of numerous often tall trees belonging to the genus Eucalyptus, of the myrtle family, native to Australia and adjacent islands, having aromatic evergreen leaves that are the source of medicinal oils and heavy wood used as timber.
Also, eucalypt [yoo-kuh-lipt] .

1800–10; < Neo-Latin < Greek eu- eu- + kalyptós covered, wrapped, akin to kalýptein to cover

eucalyptic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
eucalyptus or eucalypt (ˌjuːkəˈlɪptəs, ˈjuːkəˌlɪpt)
n , pl -lyptuses, -lypti, -lypts
any myrtaceous tree of the mostly Australian genus Eucalyptus, such as the blue gum and ironbark, widely cultivated for the medicinal oil in their leaves (eucalyptus oil), timber, and ornament
[C19: New Latin, from eu- + Greek kaluptos covered, from kaluptein to cover, hide]
eucalypt or eucalypt (ˌjuːkəˈlɪptəs, ˈjuːkəˌlɪpt, -ˈlɪptaɪ)
[C19: New Latin, from eu- + Greek kaluptos covered, from kaluptein to cover, hide]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1809, from Mod.L., coined 1788 by Fr. botanist Charles Louis L'héritier de Brutelle (1746-1800) from Gk. eu- "well" + kalyptos "covered," for the covering on the bud.
"A London thief ... lodged under the bark of the dwarf eucalyptus, and keeping sheep ... is not an uninteresting picture." [Sydney Smith, "Botany Bay," 1823]
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Cane again to the presupposed and ready eucalyptus tree, count out sherry and
  ripe plates and little corners of a kind of ham.
Koalas stick to a eucalyptus diet because of sensitive stomachs that limit what
  they can and cannot eat.
In the canyons between ridgelines the forest is mostly pine and eucalyptus,
  both introduced species.
Humans need technology to survive and koalas need eucalyptus leaves.
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