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aortic bulb in Medicine

aortic bulb

n.
  1. The dilated first part of the aorta containing the aortic semilunar valves and the aortic sinuses.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.