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hydromeningocele

(hī′drō-mə-nĭnggə-sēl′)
n.
  1. A fluid-filled protrusion of the meninges of the brain or spinal cord through a defect in the skull or vertebral column.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.