pia mater Meaning, Definition & Usage

  1. noun the highly vascular innermost of the 3 meninges

WordNet

Pi"a ma"ter
Etymology
NL., fr. L. pia (fem. of pius tender, kind) + mater mother.
Definitions
  1. (Anat.) The delicate and highly vascular membrane immediately investing the brain and spinal cord.

Webster 1913