sternum
/ˈstɜːnəm/noun
(pl. sternums或sterna /-nə/)
1- the breastbone胸骨。
1.1
- Zoology a thickened ventral plate on each segment of the body of an arthropod【动】（节肢动物躯体每节上厚厚的）腹片, 腹板。
词源
mid 17th cent.: modern Latin, from Greek sternon 'chest'.