the lowermost of the three segments of the sternum.
compare gladiolus (def 2), manubrium (def 2a).
historical examples

the vertebrate skeleton sidney h. reynolds

noun (pl) -na (-nə)
(anatomy, zoology) the cartilaginous process forming the lowermost part of the breastbone (sternum) also called xiphoid, xiphoid process
xiph’i·ster’nal adj.

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