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rooting reflex

(rōōtĭng, rutĭng)
n.
  1. A reflex in infants in which rubbing or scratching about the mouth causes the infant to turn its head toward the stimulus.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.