quinacrine: a drug (trade name Atabrine) used to treat certain worm infestations and once used to treat malaria
antimalarial: a medicinal drug used to prevent or treat malaria
ijtihad: the endeavor of a Moslem scholar to derive a rule of divine law from the Koran and Hadith without relying on the views of other scholars; by the end of the 10th century theologians decided that debate on such matters would be closed and Muslim theology and law were frozen