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WordReference Random House Unabridged Dictionary of American English © 2024pi•a ma•ter (pī′ə mā′tər, pē′ə),USA pronunciation [Anat.]- Anatomythe delicate, fibrous, and highly vascular membrane forming the innermost of the three coverings of the brain and spinal cord. Cf. arachnoid (def. 6), dura mater.
- Medieval Latin: literally, pious mother, erroneous translation of Arabic umm raqīqah tender mother
- Middle English 1350–1400
Collins Concise English Dictionary © HarperCollins Publishers:: pia mater /ˈpaɪə ˈmeɪtə/ n - the innermost of the three membranes (meninges) that cover the brain and spinal cord
See meninges
Etymology: 16th Century: from Medieval Latin, literally: pious mother, intended to translate Arabic umm raqīqah tender mother du′ra ma′ter (mā′tər),USA pronunciation [Anat.]- Anatomythe tough, fibrous membrane forming the outermost of the three coverings of the brain and spinal cord. Also called dura. Cf. arachnoid (def. 6), pia mater.
- Medieval Latin: literally, hard mother
- Middle English 1350–1400
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