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risus |
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risus /ri·sus/ (ri´sus) [L.] laughter. risus sardo´nicus a grinning expression produced by spasm of facial muscles. risus [L.] laughter. risus sardonicus a grinning expression produced by spasm of the facial muscles, typical of tetanus in humans. The term is also applied to dogs with tetanus in which the lips are drawn back by muscle spasms. |
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