A plural noun or class term referring to cinchona-related alkaloid compounds or chemical entities collectively.
From cinchona + -idia (Greek plural/collective suffix), creating a collective noun form to group related compounds. This follows classical nomenclature patterns used in natural products chemistry.
The -idia ending is borrowed from Greek and used in science to create collective nouns—like acedia (collective spiritual malaise) or monodiae—so 'cinchonidia' probably referred collectively to all the weird minor alkaloids found in cinchona that didn't fit other categories.
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