| OPI | oculoparalytic illusion; Omnibus Personality Inventory |
|---|---|
| PAP | pancreatitis-associated protein; Papanicolaou [test]; papaverine; passive-aggressive personality; pa... |
| PAS | para aminosalicylate; Parent Attitude Scale; patient administration system; patient appointments and... |
| PD | Doctor of Pharmacy; Dublin Pharmacopoeia; interpupillary distance; Paget disease; pancreatic duct; p... |
| PDQ | Personality Diagnostic Questionnaire; physician's data query; Premenstrual Distress Questionnaire; p... |