risus sardonicus
/ˌrʌɪsəs sɑːˈdɒnɪkəs/ /ˌriːsəs sɑːˈdɒnɪkəs/Medicine
noun
A fixed, grin-like expression resulting from spasm of facial muscles, especially in tetanus.
Origin
Early 17th century; earliest use found in Peter Heylyn (1599–1662), Church of England clergyman and historian. From post-classical Latin risus sardonicus from classical Latin rīsus laughter + post-classical Latin sardonicus.
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