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hypertrophic pyloric stenosis

n.
  1. Muscular hypertrophy of the pyloric sphincter associated with projectile vomiting appearing two to three weeks after birth.congenital pyloric stenosis
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.