Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The fine vascular membrane that closely envelops the brain and spinal cord under the arachnoid and the dura mater.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The inner most of the meninges membranes that surround the brain and spinal cord.

from the GNU version of the Collaborative International Dictionary of English

  • The delicate and highly vascular membrane immediately investing the brain and spinal cord.

from The Century Dictionary and Cyclopedia

  • The delicate fibrous and very vascular membrane which immediately invests the brain and spinal cord.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the highly vascular innermost of the 3 meninges

Etymologies

Middle English, from Medieval Latin pia māter : Latin pia, tender + Latin māter, mother (translation of Arabic 'umm raqīqa : 'umm, mother + raqīqa, tender).
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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