| FF | degree of fineness of abrasive particles; fat-free; father factor; fecal frequency; fertility factor... |
|---|---|
| FFP | freedom from progression; fresh frozen plasma |
| FGF | father's grandfather; fibroblast growth factor; fresh gas flow |
| fw | fresh water |
| rec | fresh [Lat. recens]; recessive; recombinant chromosome; record; recovery; recurrence, recurrent |