pia

noun2

1. •
   The pia mater, the innermost of the meninges that protect the brain and spinal cord.
2. •
   Polynesian arrowroot (Tacca leontopetaloides), whose fleshy tubers yield arrowroot starch.

noun5

1. •
   (Internet) Initialism of pain in the ass.
2. •
   Initialism of personal injury accident.
3. •
   Initialism of privacy impact assessment.
4. •
   (slang) Initialism of penis in anus.
5. •
   Initialism of porcine intestinal adenomatosis.