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The Collaborative International Dictionary of English v.0.48:

Metasternum \Met`a*ster"num\, n. [Pref. meta- + sternum.] 1. (Anat.) The most posterior element of the sternum; the ensiform process; xiphisternum. [1913 Webster] 2. (Zool.) The ventral plate of the third or last segment of the thorax of insects. [1913 Webster] Metastoma
The Collaborative International Dictionary of English v.0.48:

Xiphisternum \Xiph"i*ster"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"i*ster"nala. [1913 Webster]