pia-mater
Pi"a ma"ter. Etym: [NL., fr. L. pia (fem. of pius tender, kind) + mater mother.] (Anat.) Defn: The delicate and highly vascular membrane immediately investing the brain and spinal cord.
Pi"a ma"ter. Etym: [NL., fr. L. pia (fem. of pius tender, kind) + mater mother.] (Anat.) Defn: The delicate and highly vascular membrane immediately investing the brain and spinal cord.