/kwin"i deen', -din/ , n. Pharm.
a colorless, crystalline alkaloid, C 20 H 24 N 2 O 2 , isomeric with quinine, obtained from the bark of certain species of cinchona trees or shrubs, used chiefly to regulate heart rhythm and to treat malaria.
[ 1830-40; QUIN(INE) + -ID 3 + -INE 2 ]