Adjective:

1. not connected to the sternum or breastbone;

   "asternal ribs"
   

asternadv.在船尾；向船尾；向后地adj.在船尾的；向船尾的；向后的asternal ribs假肋astern nozzle尾部嘴astern firing船尾射击astern turbine倒车轮机,倒车汽轮机astern running倒车astern cylinder倒车涡轮壳体astern-turbine倒车透平astern powertest倒车性能试验astern bevel gear后退伞形齿轮astern synchro-倒车自动同步发送器