RISUS
\ɹˈɪsəs], \ɹˈɪsəs], \ɹ_ˈɪ_s_ə_s]\
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By Thomas Davidson
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An involuntary movement of the muscles of the face, and of the lips in particular, accompanied with a sonorous and interrupted respiration, commonly indicating mirth and satisfaction.
By Robley Dunglison