What is the X in X-mas?
1520s, in Scots law, "act of disabling or wounding a limb," from Middle French mutilation and directly from Late Latin mutilationem (nominative mutilatio), noun of action from past participle stem of Latin mutilare "to cut or lop off," from mutilus "maimed," which perhaps is cognate with Greek mytilos "hornless." Of things, "a destroying of unity by damaging or removing a part," from 1630s.
1530s, of things; 1560s, of persons; from Latin mutilatus, past participle of mutilare "to cut off, lop off, cut short; maim, mutilate," from mutilus "maimed" (see mutilation). Technically, to deprive of some principal part, especially by cutting off. Related: Mutilated; mutilating.
mutilation mu·ti·la·tion (myōōt'l-ā'shən)
Disfigurement or injury by removal or destruction of a conspicuous or essential part of the body.