quinoidine
noun
qui·noi·dine
| \ kwə̇ˈnȯiˌdēn, -dᵊn\
variants:
or quinoidin \ -dᵊn \
plural -s
Definition of quinoidine
: a bitter brownish resinous mixture often molded into sticks of amorphous alkaloids obtained as a by-product in the extraction of cinchona bark for crystalline alkaloids and formerly used as a substitute for quinine
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