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snout reflex

(snout)
n.
  1. A pouting or pursing of the lips that is caused by light tapping of the closed lips near the midline, seen in defective pyramidal innervation of facial musculature.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.