[kwi-noi-deen, -din]

noun Pharmacology.

a brownish-black, resinous substance consisting of a mixture of alkaloids, obtained as a by-product in the manufacture of quinine and formerly used as a cheap substitute for it.

Origin of quinoidine

First recorded in 1835–45; quin(ine) + -oid + -ine2
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quinoidine in Medicine


[kwĭ-noidēn′, -dĭn]


A brownish-black mixture of alkaloids remaining after extraction of crystalline alkaloids from cinchona bark, used as a quinine substitute.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.