• Webster's Revised Unabridged Dictionary
    • n Xiphisternum (Anat) The posterior segment, or extremity, of the sternum; -- sometimes called metasternum ensiform cartilage ensiform process, or xiphoid process.
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Century Dictionary and Cyclopedia
    • n xiphisternum The hindmost segment or division of the sternum, corresponding to the xiphoid appendage or ensiform cartilage of man. It is of various shapes in different animals, sometimes forked or double, there being a right and a left xiphisternum, as in some lizards. It succeeds the segment or segments called the mesosternum. See cuts under mesosternum and sternum.
    • n xiphisternum The xiphiplastron of a turtle. See second cut under Chelonia.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. xi`fos a sword + sternum,


In literature:

The xiphisternum will probably be cut in this operation.
"Text Book of Biology, Part 1: Vertebrata" by H. G. Wells