| FEV1% | ratio of FEV1 to FVC |
|---|---|
| FH/BC | frontal horn/bicaudate [ratio] |
| FR | failure rate; film-screen radiograph; fasciculus retroflexus; febrile reaction; feedback regulation;... |
| FRCD | Fellow of the Royal College of Dentists; fixed ratio combination drug |
| FTIR | Fourier-transformed infrared; functional terminal innervation ratio |