rigor mortis
noun [ U ] medical specialized uk/ˌrɪɡ.ə ˈmɔː.tɪs/ us/ˌrɪɡ.ɚ ˈmɔːr.t̬ɪs/
尸僵;死后强直
the stiffness of the joints (= places where two bones are connected) and muscles of a dead body
Rigor mortis usually sets in between two and four hours after death. 通常死后2至4小时就会开始出现尸僵。