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hy·dro·qui·nine | \ ˌhī-drō-ˈkwī-ˌnīn also -ˈkwin-ˌīn, especially British -kwin-ˈēn, -ˈkwin-ˌēn 
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\Medical Definition of hydroquinine
: a bitter crystalline antipyretic alkaloid C20H26N2O2 found with quinine in cinchona bark and usually present in commercial quinine
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