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risus caninus

(rīsəs kā-nīnəs)
n.
  1. The semblance of a grin caused by facial spasm, as in tetanus.canine spasm cynic spasm sardonic grin
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.