Found 2 items, similar to pia mater.
English → English (WordNet) Definition: pia mater pia mater n : the highly vascular innermost of the 3 meninges
English → English (gcide) Definition: Pia mater Pia mater \Pi“a ma”ter\ [NL., fr. L. pia (fem. of pius tender, kind) + mater mother.] (Anat.) The delicate and highly vascular membrane immediately investing the brain and spinal cord. [1913 Webster]