Webster's English Dictionary

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rhamnus

rham.nus \-n*s\ n [NL, genus name, fr. Gk rhamnos buckthorn; akin to Gk 
   rhabdos rod] : any of a genus (Rhamnus) of trees and shrubs of the 
   buckthorn fami ly with pinnately veined leaves, small perfect or polygamous 
   flowers with the ovary free from the disk, and a fruit that is a drupe