What is the X in X-mas?
mid-13c., "to cut off the foreskin," from Old French circoncisier "circumcise" (12c., Modern French circoncire), from Latin circumcisus, past participle of circumcidere "to cut round, to cut trim, to cut off" (see circumcision). Related: Circumcised; circumcising.
circumcise cir·cum·cise (sûr'kəm-sīz')
v. cir·cum·cised, cir·cum·cis·ing, cir·cum·cis·es
To perform a circumcision.