[kwi-noi-deen, -din] 
| 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. |
| qui·noi·dine (kwĭ-noi'dēn', -dĭn) n. A brownish-black mixture of alkaloids remaining after extraction of crystalline alkaloids from cinchona bark, used as a quinine substitute. |
quinoidine qui·noi·dine (kwĭ-noi'dēn', -dĭn)
n.
A brownish-black mixture of alkaloids remaining after extraction of crystalline alkaloids from cinchona bark, used as a quinine substitute.
din