Rigor Mortis
noun /ˌrɪɡ.ər ˈmɔːr.tɪs/ — The stiffening of muscles after death
Definition
The temporary stiffening of muscles that occurs in a dead body a few hours after death, caused by chemical changes in muscle tissue. Rigor mortis is one of the body's last declarations — the muscles locking as cellular processes cease.
Beyond the definition
Rigor mortis is the body's final rigidity — the irony of the ultimate stiffness at the moment of ultimate passivity. The word appears in forensics, in literature, and in any moment when something that was once alive has set into permanence.
Origin & history
Latin: rigor (stiffness, severity) + mortis (of death, genitive of mors). 'The stiffness of death'. The Latin creates a clinical distance from the physical reality it describes.
Example sentences
Illustrative sentences for learning, not verified community posts or sourced quotations.
The coroner estimated time of death from the stage of rigor mortis.
Rigor mortis sets in within hours — the body's first independent action after life.
In literature, rigor mortis is the word for ideas and institutions that have died but not yet been buried.
How to use it
This entry uses a noun. Follow the examples for articles and singular or plural forms; not every noun takes “a” or “an.”
Choose “Rigor Mortis” when the meaning fits your context: The temporary stiffening of muscles that occurs in a dead body a few hours after death, caused by chemical changes in muscle tissue. Rigor mortis is one of the body's last declarations — the muscles locking as cellular processes cease.
Synonyms
death stiffness, post-mortem rigidity
Related words
Rigor Mortis vs livor mortis
Rigor mortis is the stiffening of muscles after death. Livor mortis is the pooling of blood in the lower parts of the body after death.
Word in the Wild
See how this word appears in life, language and stories.
Illustrative sentences and imagined stories for learning — not verified sightings, interviews, or sourced quotations.
Fictional scene
Stillness of Potential Stasis
An adult sits at a piano with hands hovering over the keys but not touching.
The expectant, held stillness of the hands captures the tension of a potential state. Rigor mortis is a final declaration of chemical stasis in muscles, much like the musician’s hands are locked in a state of suspended potential.
Image credit: Wordspun · AI-generated conceptual illustration
Questions about this word
What does "Rigor Mortis" mean?
Rigor Mortis is noun meaning: The stiffening of muscles after death. The temporary stiffening of muscles that occurs in a dead body a few hours after death, caused by chemical changes in muscle tissue. Rigor mortis is one of the body's last declarations — the muscles locking as cellular processes cease.
Where does the word "Rigor Mortis" come from?
Latin: rigor (stiffness, severity) + mortis (of death, genitive of mors). 'The stiffness of death'. The Latin creates a clinical distance from the physical reality it describes.