pia mater

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pia ma·ter

 (mā′tər, mä′tər)
n.
The fine vascular membrane that closely envelops the brain and spinal cord under the arachnoid and the dura mater.

[Middle English, from Medieval Latin pia māter : Latin pia, tender + Latin māter, mother (translation of Arabic 'umm raqīqa : 'umm, mother + raqīqa, tender).]

pia mater

(ˈpaɪə ˈmeɪtə)
n
(Anatomy) the innermost of the three membranes (meninges) that cover the brain and spinal cord. See meninges
[C16: from Medieval Latin, literally: pious mother, intended to translate Arabic umm raqīqah tender mother]

pi•a ma•ter

(ˈpaɪ ə ˈmeɪ tər, ˈpi ə)
n.
the delicate, fibrous, and highly vascular membrane forming the innermost of the three coverings of the brain and spinal cord. Compare arachnoid (def. 4), dura mater.
[1350–1400; Middle English < Medieval Latin: literally, pious mother, erroneous translation of Arabic umm raqīqah tender mother]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pia mater - the highly vascular innermost of the 3 meningespia mater - the highly vascular innermost of the 3 meninges
meninges, meninx - a membrane (one of 3) that envelops the brain and spinal cord
leptomeninges - the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers
Translations

pi·a mat·er

n. L. piamáter, piamadre, membrana vascular fina, la más interna de las meninges.