from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A monogram and symbol for Christ, consisting of the superimposed Greek letters chi (Χ) and rho (Ρ), often embroidered on altar cloths and clerical vestments. Also called Christogram.
chi1 + rho, first two letters of Greek Khrīstos, Christ.(American Heritage® Dictionary of the English Language, Fourth Edition)