The Collaborative International Dictionary
Xiphisternal
Xiphisternum \Xiph"i*ster"num\, n.; pl. Xiphisterna. [NL., fr. Gr. xi`fos a sword + sternum.] (Anat.)
The posterior segment, or extremity, of the sternum; -- sometimes called metasternum, ensiform cartilage, ensiform process, or xiphoid process.
The xiphiplastron. -- Xiph"i*ster"nala.
Wiktionary
xiphisternal
a. of, or relating to the xiphisternum