1.n. The most posterior element of the sternum; the ensiform process; xiphisternum.
Medical Definition of Metasternum
1.
1. The most posterior element of the sternum; the ensiform process; xiphisternum.
2. The ventral plate of the third or last segment of the thorax of insects.
Origin: Pref. Meta- + sternum.
Source: Websters Dictionary
(01 Mar 1998)