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Definition of rigor mortis noun from the Oxford Advanced American Dictionary

 

rigor mortis

 noun
noun
NAmE//ˌrɪɡər ˈmɔrt̮əs//
 
[uncountable]
 
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the process by which the body becomes stiff after death Rigor mortis had already set in.
See the Oxford Advanced Learner's Dictionary entry: rigor mortis