quassia
Any of a group of tropical American trees with bitter bark and wood. The heartwood of Q. amara is a source of quassiin, an infusion of which was formerly used as a tonic; it is now used in insecticides. (Genus Quassia, family Simaroubaceae.)
The quassia family includes the Asian ailanthus (Ailanthus altissima), also called the tree of heaven.
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