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protoduodenum

(prō′tō-dōō′ə-dēnəm, -dōō-ŏdn-əm)
n.
  1. The first part of the duodenum extending from the gastroduodenal pylorus to the major duodenal papilla and containing the duodenal glands.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.