Pronunciation: (kwosh'u, -ē-u),[key] —n. 1. a shrub or small tree, Quassia amara, of tropical America, having pinnate leaves, showy red flowers, and wood with a bitter taste. Cf. quassia family. 2. any of several other trees having bitter-tasting wood.
3. Also called bitterwood.Chem.,Pharm.a prepared form of the heartwood of any of these trees, used as an insecticide and in medicine as a tonic to dispel intestinal worms.