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