nut/nʌt; nʌt/n [C]1 a large seed that you can eat, that usually grows in a hard brown shell (坚)果仁: a cashew nut 腰果2 a small piece of metal with a hole in the middle that is screwed onto a BOLT to fasten things together 螺母﹐螺帽3 informal someone who is crazy or behaves strangely【非正式】疯子﹔怪人4 golf/opera etc nutinformal someone who is very interested in golf etc [→ fanatic]【非正式】高尔夫球/歌剧等迷