| FET | field-effect transistor; forced expiratory time |
|---|---|
| FF | degree of fineness of abrasive particles; fat-free; father factor; fecal frequency; fertility factor... |
| FFE | fast field echo; fecal fat excretion |
| FFF | degree of fineness of abrasive particles; field-flow fractionation; flicker fusion frequency |
| FIM | field ion microscopy; functional independence measure |
| filiform pulse | A thready pulse. (05 Mar 2000) |
|---|---|
| fixed rate pulse generator | A generator in which the rate of discharge is independent of the natural activity of the heart. Synonym: fixed rate pulse generator. (05 Mar 2000) |
| labile pulse | Frequent changes in pulse rate. (05 Mar 2000) |
| long pulse | A pulse in which the impact is felt longer than usual. (05 Mar 2000) |