episternum
/ˌepɪˈstɜːnəm/noun
(pl. episternums 或 episterna /-nə/)
1- Zoology a bone between the clavicles, especially (in mammals) the upper part of the sternum【动】（哺乳动物的）上胸骨。
1.1
- Entomology (in insects) the anterior part of the side wall of a thoracic segment【昆】（昆虫的）前侧片。