trismus
/ˈtrɪzməs/noun
mass noun
- Medicine spasm of the jaw muscles, causing the mouth to remain tightly closed, typically as a symptom of tetanus【医】（尤指作为破伤风症状, 因颚部肌肉痉挛而造成的）牙关紧闭。亦称LOCKJAW.
词源
late 17th cent.: from modern Latin, from Greek trismos 'a scream, grinding'.