[1] : The Collaborative International Dictionary of English v.0.48

xiphisternum \xiph"ister"num\, n.; pl. xiphisterna. nl., fr.
   gr. xi`fos a sword + sternum. anat.
   a the posterior segment, or extremity, of the sternum; --
       sometimes called metasternum, ensiform cartilage,
       ensiform process, or xiphoid process.
   b the xiphiplastron. -- xiph"ister"nala.
       1913 webster
see also:
xiphisterna metasternum ensiform cartilage ensiform process xiphoid process xiph"ister"nal 

[2] : The Collaborative International Dictionary of English v.0.48

ensiform \en"siform\, a. l. ensis sword + -form: cf. f.
   ensiforme.
   having the form of a sword blade; sword-shaped; as, an
   ensiform leaf.
   1913 webster

   ensiform cartilage,  ensiform process. anat. see
      xiphisternum.
      1913 webster
see also:
ensiform cartilage ensiform process xiphisternum 

Ensiform >> E Words
Ensiform, definition of term: Ensiform
ensiform_pag1.html

Cartilage >> C Words
Cartilage, definition of term: Cartilage
cartilage_pag1.html