Webster's English Dictionary

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eucalyptus

eu.ca.lyp.tus \-k*-'lip-t*s\ \-.ti-, -.te-\ n or eu.ca.lyp.ti or 
   eu.ca.lyp.tus.es [NL, genus name, fr. eu- + Gk kalyptos covered, fr. 
   kalyptein] pl  to congeal; fr. the conical covering of the buds : any of a 
   genus (Eucalyptus) of mostly Australian evergreen trees o r rarely shrubs 
   of the myrtle family having rigid entire leaves and umbellate flowers and 
   yielding gums, resins, oils, and useful woods