Manus
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Lat. A hand. In the civil law, this wod signified power, control, authority, the right of physical coercion, and was often used as synonymous with "potestas." In old English law, it signified an oath or the person taking an oath; a compurgator.
— Manus mortua. A dead hand; mortmain. Spelman.