fever tree (Noun) — Any of several trees having leaves or bark used to allay fever or thought to indicate regions free of fever.
fever tree (Noun) — Ornamental shrub or small tree of swampy areas in southwestern United States having large pink or white sepals and yielding Georgia bark for treating fever.
fever tree (Noun) — Tall fast-growing timber tree with leaves containing a medicinal oil; young leaves are bluish.
fever tree (Noun) — African tree supposed to mark healthful regions.