pinhead /ˈpɪnˌhɛd/

• 1. 

  N-COUNT A pinhead is the small metal or plastic part on the top of a pin. 大头针的平头

  例：

  It may even be possible to make computers the size of a pinhead one day.

  有一天，甚至有可能把计算机做得象针头一样小。