risus sardonicus
noun
ri·sus sar·do·ni·cus
| \ ˈrī-səs-ˌsär-ˈdän-i-kəs
, ˈrē-
\
, ˈrē-
\
Medical Definition of risus sardonicus
: a facial expression characterized by raised eyebrows and grinning distortion of the face resulting from spasm of facial muscles especially in tetanus