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Vater's ampulla

(fätərz)
n.
  1. The dilation within the major duodenal papilla, formed by the junction of the common bile duct and the main pancreatic duct.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.