| NRI | nerve root involvement; nerve root irritation; nonrespiratory infection |
|---|---|
| PN | papillary necrosis; parenteral nutrition; penicillin; perceived noise; percussion note; periarteriti... |
| AFA | acromegaloid facial syndrome; advanced first aid; alcohol-formaldehyde-acetic [fixative] |
| AFH | angiofollicular hyperplasia; anterior facial height |
| AFP | alpha-fetoprotein; anterior faucial pillar; atypical facial pain |