rigor mortis rigor mor·tis (môr'tĭs)
Muscular stiffening following death. Also called postmortem rigidity.
Stiffening of the muscles of the body that occurs after death. Rigor mortis is Latin for “stiffness of death.”
Note: Figuratively, rigor mortis refers to an absence of flexibility or vitality: “By the time the school finally closed, rigor mortis had set in in nearly every department.”