| NFL | nerve fiber layer; neurofilament protein, light polypeptide |
|---|---|
| NFLD | nerve fiber layer defect |
| OSF | organ system failure; osteoclast-stimulating factor; outer spiral fiber; overgrowth stimulating fact... |
| PF | pair feeding; peak flow; perfusion fluid; pericardial fluid; periosteal fibroblast; peritoneal fluid... |
| PLF | perilymphatic fistula; posterior lung fiber |