rigor mortis[rig′ər môr′tis; occas. rī′gôr]
the progressive stiffening of the muscles that occurs several hours after death as a result of the coagulation of the muscle protein
Origin of rigor mortisModern Latin stiffness of death
Muscular stiffening following death.
Origin of rigor mortisLatin : rigor, stiffness + mortis, genitive of mors, death.