risus caninus

[ rīsəs kā-nīnəs ]

n.

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