| MBL | Marine Biological Laboratory; menstrual blood loss; minimum bactericidal level |
|---|---|
| PLL | peripheral light loss; phase-locked loop; poly-L-lysine; pressure length loop; posterior longitudina... |
| PVL | perivalvular leakage; permanent vision loss |
| REL | rate of energy loss; recommended exposure limit; resting expiratory level |
| TEWL | transepidermal water loss |