| FF | degree of fineness of abrasive particles; fat-free; father factor; fecal frequency; fertility factor... |
|---|---|
| DF | decapacitation factor; decontamination factor; deferoxamine; deficiency factor; defined flora [anima... |
| FGF | father's grandfather; fibroblast growth factor; fresh gas flow |
| FGM | father's grandmother |
| M& | F male and female; mother and father |