American Heritage® Dictionary of the English Language, Fourth Edition
- n. A brownish-black mixture of alkaloids remaining after extraction of crystalline alkaloids from cinchona bark, used as a quinine substitute.
Century Dictionary and Cyclopedia
- n. Same as chinoidine.
- n. chemistry, dated A brownish resinous substance obtained as a by-product in the treatment of cinchona bark.
GNU Webster's 1913
- n. (Med. Chem.) A brownish resinous substance obtained as a by-product in the treatment of cinchona bark. It consists of a mixture of several alkaloids.
“It differs from _quinoidine_ in that it is inactive (?) and that in combination with platinum it retains less of this metal than does quinoidine.”
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