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substantia medullaris in Medicine

substantia medullaris

(mĕd′l-ârĭs)
n.
  1. Medulla.
  2. Medullary substance.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.