| FFF | degree of fineness of abrasive particles; field-flow fractionation; flicker fusion frequency |
|---|---|
| FFI | family function index; free from infection; fundamental frequency indicator |
| FHF | fetal heart frequency; fulminant hepatic failure |
| FM | face mask; facilities management; family medicine; feedback mechanism; fetal movement; fibromuscular... |
| Fmed | median frequency |