One of the mysteries of the English language finally explained.
A tropical wood used, in the form of an aqueous infusion, to treat diseases or pain of the kidneys (especially kidney stones).
Mid 17th century; earliest use found in John Parkinson (1566/7–1650), apothecary and herbalist. From post-classical Latin lignum nephriticum from classical Latin lignum wood + post-classical Latin nephriticum.
lignum nephriticum/ˈlɪɡnəm nɪˈfrɪtɪkəm/
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