rigor mortis noun 1verb 1forms 3 noun1 •Temporary stiffness of the body's muscles and joints following death.Such are the principal phenomena observed during that form of contraction which I conceive to be analogous to the rigor mortis... — 1840 verb1 •To stiffen the muscles and joints with, or as if with, rigor mortis.As Olive was in the kitchen making some tea I asked what kind of louse the host was. “The kind you like to see laying out on a mortuary slab rigor mortising before the introduction.” — 1964 formsrigor mortised · rigor mortising · rigor mortises