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The Collaborative International Dictionary
Xiphisterna

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
xiphisterna

n. (plural of xiphisternum English)

WordNet
xiphisterna