n 1  cap  :  a genus of mostly Australian evergreen trees or rarely shrubs of the myrtle family that have rigid entire leaves and umbellate flowers and are widely cultivated for their gums, resins, oils, and useful woods  2  pl  -ti  or  -tus*es  :  any tree or shrub of the genus Eucalyptus eucalyptus adj 
 
 
 
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