Plural form of cinchona; multiple cinchona trees or specimens of the plant, or various types and species of cinchona plants.
Simple pluralization of cinchona using English -s suffix, creating the standard plural form to refer to multiple trees or instances of the plant.
The word cinchona itself has such an unusual origin story that even its plural is interesting—you're literally pluralizing a name mistakenly attributed to a European countess who probably never even took the medicine.
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