pia

deepest layer of meningeal coverings of the brain, just superficial to the brain cortex/spinal cord and just deep to the arachnoid. reflects into all the sulci of the brain and is well vascularized. paper thin, aids in nourishing, cushioning, and protecting the CNS. gets inflamed during meningitis infection, with resulting CNS impairment.

The pia mater is extremely hard to pick away from the gross brain/spinal cord ... haha, now you're sharing in my pain of getting through medschool!

by UCLAcrewDude March 08, 2004

PIA

Abbreviation for penis-in-anus sex, that is, sexual intercourse via the anus (anal sex).

Conner told his boyfriend he'd rather do PIA than settle for head.

Yesterday Marcus had condomless PIA sex with his wife.

by Tyler123446 December 01, 2021

PIA

Pain In the Ass

Just attach the file next time ... OneDrive links are a PIA

by Pieter Doobes February 16, 2023

PIA

Pain In Ass.

That lady is a real PIA

by Jen-na-na February 19, 2010

Pia

A sassy friend of Kasofia

“Pia is a bestfriend of Kasofia.”

by ✨TheBestPersonInTheUniverse✨ May 09, 2021

PIA

Pain in the ass

Phil can be such a PIA.

by tropicboy May 22, 2020

pia

so perfect, loving, individual, precious, cute, what else could i want? oh yeah and mexican

and then the pia flew down from above to save me

by The One March 08, 2005