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From The Collaborative International Dictionary of English v.0.48:
Quassia \Quas"si*a\, n. [NL. From the name of a negro, Quassy, or Quash, who prescribed this article as a specific.] The wood of several tropical American trees of the order Simarube[ae], as Quassia amara, Picr[ae]na excelsa, and Simaruba amara. It is intensely bitter, and is used in medicine and sometimes as a substitute for hops in making beer. [1913 Webster]