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diastematomyelia

(dī′ə-stē′mə-tō-mī-ēlē-ə)
n.
  1. A congenital defect in which the spinal cord is divided into halves by a bony or cartilaginous septum, often seen in spina bifida.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.