Pia
Full definition of pia
Noun
pia
(uncountable)- (anatomy) The pia mater, the innermost of the meninges that protect the brain and spinal cord
- One screen in the theatre relays live colour pictures of Harkness and his colleague Tiernan Byrnes's progress, cutting and pushing through first the dura, then the arachnoid and finally the pia, the thin, spider's web-type membranes that cover the brain itself.