pillbox
/ˈpɪlbɒks/noun
1- a small shallow cylindrical box for holding pills（小圆筒形）药丸盒; 药片盒。
1.1
- a hat of a similar shape圆筒形女帽。
1.2
- a small enclosed, partly underground, concrete fort used as an outpost碉堡; 掩体。