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What is "metasternum"

The Collaborative International Dictionary
metasternum

Xiphisternum \Xiph"i*ster"num\, n.; pl. Xiphisterna. [NL., fr. Gr. xi`fos a sword + sternum.] (Anat.)

  1. The posterior segment, or extremity, of the sternum; -- sometimes called metasternum, ensiform cartilage, ensiform process, or xiphoid process.

  2. The xiphiplastron. -- Xiph"i*ster"nala.

Wiktionary
metasternum

n. 1 (context anatomy English) The most posterior element of the sternum; the ensiform process; xiphisternum 2 (context zoology English) The ventral plate of the third or last segment of the thorax of insects.