From Wiktionary, the free dictionary
From xiphoid + -ian.
xiphoidian (not comparable)
- (anatomy, rare) xiphoid
1936, Louis Hamman, International Clinics: A Quarterly of Illustrated Clinical Lectures:...the deep xiphoidian para-umbilical vein which anastomoses the umbilical circulation, tributary of the portal vein to the xiphoidian plexus...