| FF | degree of fineness of abrasive particles; fat-free; father factor; fecal frequency; fertility factor... |
|---|---|
| FFF | degree of fineness of abrasive particles; field-flow fractionation; flicker fusion frequency |
| NK cell | Natural Killer cell |
| CNL | cardiolipin natural lecithin; chronic neutrophilic leukemia |
| DND | died a natural death |