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hydromyelia

(hī′drō-mī-ēlē-ə)
n.
  1. A dilation of the central canal of the spinal cord caused by an increase of fluid.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.