One of the mysteries of the English language finally explained.
1A reddish form of cinchona bark used medicinally as a source of quinine, specifically that obtained from Cinchona pubescens (formerly called C. succirubra).
2More fully "red bark tree". The tree Cinchona pubescens.
Late 18th century; earliest use found in William Saunders (1743–1817), physician. From red + bark.
red bark/ˌrɛd ˈbɑːk/
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