omphalos /ˈɒmfəˌlɒs/

• 1. 

  N (in the ancient world) a sacred conical object, esp a stone. The most famous omphalos at Delphi was assumed to mark the centre of the earth (古世界)圆锥形石; 在希腊古都特尔斐的最为著名，被假定为标出地球的中心