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Bitterwood, the heartwood of Picrasma excelsa (Picraena excelsa), known as Jamaica quassia, or of Quassia amara (family Simaroubaceae), known as Surinam quassia; a bitter tonic; the infusion has been administered by enema in the treatment of threadworms.
[Quassi, a resident of Surinam who used it as a tonic]

Quassia (kwä·sh),

n a genus of the trees that belong to the family
Simaroubaceae, wood of which is used as a fever reducer.