American Heritage Dictionary of the English Language, 5th Edition
From Latinrigormortis, literally "stiffness of death".
Rigor-mortis Sentence Examples
After death the position of the body may or may not be flexed; usually rigor mortis develops rapidly.
The cardiac contractions become irregular, the ventricle assumes curious shapes - "hour-glass," &c. - becomes very pale and bloodless, and finally the heart stops in a state of spasm, which shortly afterwards becomes rigor-mortis.
What are the changes that take place in the human body after death which account for the description rigor mortis?
No one has ever had rigor mortis on DNP or even severe cramping that has ever been documented.
They are in a state of extreme contraction, far exceeding the usual rigor mortis.