[医] 剑突(胸骨)

Metasternum \Met`a*ster"num\, n. [Pref. meta- + sternum.]
1. (Anat.) The most posterior element of the sternum; the
ensiform process; xiphisternum.

2. (Zo["o]l.) The ventral plate of the third or last segment
of the thorax of insects.

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"nal}a.