Definition from Wiktionary, the free dictionary
Medieval Latin, meaning "tender mother".
- (anatomy) The innermost of the meninges, the membranes that surround the brain and spinal cord.
2013 May-June, Charles T. Ambrose, “Alzheimer’s Disease”, American Scientist, volume 101, number 3, page 200:
- Similar studies of rats have employed four different intracranial resorbable, slow sustained release systems— […]. Such a slow-release device containing angiogenic factors could be placed on the pia mater covering the cerebral cortex and tested in persons with senile dementia in long term studies.