mass noun
1- the husks of corn or other seed separated by winnowing or threshing（被风选或脱粒的）粗糠, 谷壳。
1.1
- chopped hay and straw used as fodder（切碎作饲料的）干草, 草料。
1.2
- figurative worthless things; rubbish〈喻〉废物; 垃圾。
1.3
- strips of metal foil released in the atmosphere from aircraft, or deployed as missiles, to obstruct radar detection（干扰雷达用的）金属箔片。
短语
separate（或sort）the wheat from the chaff
- distinguish valuable people or things from worthless ones去芜存菁, 区分好坏。
派生词
chaffy
adjective词源
Old English cæf， ceaf， probably from a Germanic base meaning 'gnaw'; related to Dutch kaf, also to CHAFER.