coarb, also comarb /kōˈärb/ (historical)

1. The head of a family in an Irish sept
2. An ecclesiastical successor

• xiphosuran
• xis
• XL
• Xm
• Xmas
• XML
• XMS
• Xn
• XNOR
• xoana
• xoanon
• XOR
• Xosa
• XP
• X-particle
• X-rated
• xray
• X-ray
• Xray
• X-ray astronomy
• X-ray crystallography
• X-ray diffraction
• X-rayed
• X-raying
• X-ray micrography