xiphisterˈnum noun

A process at the lower end of the sternum

xiphˈoid adjective (anatomy)

1. Sword-shaped
2. Relating to or designating the xiphoid process or xiphisternum (also, when cartilaginous, known as xiphoid cartilage)

xiphoidˈal adjective

xiphopagic /-pajˈik/ or xiphopˈagous adjective

xiphopˈagus noun

(Gr pēgnynai to fix or fasten together) conjoined twins joined in the region of the xiphoid cartilage

xiphophyllous /-ə-filˈəs/ adjective

(Gr phyllon leaf) with sword-shaped leaves

Xiphosura /-ō-sūˈrə/ noun

(formed irregularly from Gr ourā tail) an order of Arthropoda of which the only survivors are the king crabs

xiphosuˈran adjective and noun