| FF | degree of fineness of abrasive particles; fat-free; father factor; fecal frequency; fertility factor... |
|---|---|
| ff+ | fertility inhibition positive |
| ff- | fertility inhibition negative |
| FRF | Fertility Research Foundation; follicle-stimulating hormone-releasing factor |
| IBIDS | ichthyosis-brittle hair-impaired intelligence-decreased fertility-short stature [syndrome] |