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hiatus esophageus

(ē′sə-fājē-əs)
n.
  1. The opening in the diaphragm between the central tendon and the aortic foramen through which the esophagus and the two vagus nerves pass.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.