risus

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risus

 [ri´sus] (L.)
laughter.
risus sardo´nicus a grinning expression produced by spasm of the facial muscles; seen in tetanus and certain types of poisoning.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ri·sus

(rī'sŭs), The plural of this word is risus, not risi.
Laughter.
[laughter]
Farlex Partner Medical Dictionary © Farlex 2012