quinine

n [U] bitter liquid made from the bark of a tree and used in drinks or as a medicine against fever 奎宁; 金鸡纳霜.

quicksilver, quickstep, quid, quid pro quo, quiescence, quiescent, quiet, quieten, quietism, quietist, quietly, quietness, quietude, quietus, quiff, quill, quilt, quin, quince, quincentenary, Quinquagesima, quinsy, quintessence, quintessential, quintessentially, quintet, quintuplet, quip, quire, quirk, quirkiness, quirky, quisling, quit, quite, quite a few, quite a little, quite other, quits, quitter,