1 [C] a small piece of metal that sticks out from the rest of the surface that it is fixed to 某物表面的金属突出物；饰钉: a black leather jacket with studs all over it 布满饰片的黑色皮夹克

2 [C] a small, round, solid piece of metal that you wear through a hole in your ear or other part of the body 耳环；（穿在身体其他部份的）环

3 [C] one of the pieces of plastic or metal that stick out from the bottom of football, etc boots and that help you stand up on wet ground （足球鞋等运动鞋底的）鞋钉，防滑钉

4 [C,U] a number of high quality horses or other animals that are kept for breeding young animals; the place where these horses, etc are kept 种马；配种用的动物；种马场: a stud farm 种马场