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Meaning of pia mater

pi•a ma•ter

Pronunciation: (pī'u mā'tur, pē'u), [key]
— Anat. Anat.
  1. the delicate, fibrous, and highly vascular membrane forming the innermost of the three coverings of the brain and spinal cord. Cf.(def. 6),
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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