|—n , pl -na, -nums|
|1.||Nontechnical name: breastbone (in man) a long flat vertical bone, situated in front of the thorax, to which are attached the collarbone and the first seven pairs of ribs|
|2.||the corresponding part in many other vertebrates|
|3.||Compare tergum a cuticular plate covering the ventral surface of a body segment of an arthropod|
|[C17: via New Latin from Greek sternon breastbone]|
sternum ster·num (stûr'nəm)
n. pl. ster·nums or ster·na (-nə)
A long flat bone, articulating with the cartilages of the first seven ribs and with the clavicle, forming the middle part of the anterior wall of the thorax, and consisting of the corpus, manubrium, and xiphoid process. Also called breastbone.