founder cell - gastrorrhexis
- founder cell
- fountain decussation of meynert
- fountain syringe
- four-chamber bath
- four-flanged nail
- four-point gait
- four-sided nail
- four-tailed bandage
- four-week
- four-week menstrual cycle
- fourchette
- Fourier transform
- Fourier transformer
- fourneau
- fourth disease
- fourth heart sound
- fourth position
- fourth venereal disease
- fourth ventricle of cerebrum
- fourth ventricle syndrome
