Of, relating to, or belonging to the cinchona plant family or sharing characteristics with cinchona plants.
From cinchona + Latin -aceous (full of, resembling), an adjectival suffix meaning 'of the nature of.' This forms the adjectival equivalent of the noun family name Cinchonaceae, following standard botanical nomenclature.
Notice how -aceous is used for entire plant families—herbaceous, cretaceous, rosaceous—it's like a universal botanical adjective that tells you 'this belongs to a family of plants' without naming the specific one.
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