| risus caninus | The semblance of a grin caused by facial spasm especially in tetanus. Synonym: canine spasm, cynic spasm, risus sardonicus, sardonic grin, spasmus caninus, trismus sardonicus. Origin: L. Risus, laugh + caninus, doglike (05 Mar 2000) |
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| risus sardonicus | Synonym: risus caninus. Origin: L. Risus, laughter, + sardonicus, fr. G. Sardanios, scornful, infl. By sardonios, Sardinian, ref. To effects of Strychnos nux-vomica, poisonous herb fr. Sardinia (05 Mar 2000) |