| FEVB | frequency ectopic ventricular beat |
|---|---|
| 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 |
| FFI | family function index; free from infection; fundamental frequency indicator |
| FHF | fetal heart frequency; fulminant hepatic failure |