blood transfusion 
noun
An injection of a volume of blood, previously taken from a healthy person, into a patient: surgeons gave the boy a blood transfusion [mass noun]: the patient did not require blood transfusion...
- In severe cases of B12-deficiency anaemia, a blood transfusion may be required.
- There is cause for concern any time a patient receives a blood transfusion.
- Doctors have ruled out surgery or a blood transfusion as a cause.
- frog spear
- frogstool
- frog tadpole
- frog tribe
- frogwoman
- froideur
- frolic
- frolicker
- frolicsome
- frolicsomely
- frolicsomeness
- from
- from above
- from above-stairs
- from a child
- fromage blanc
- fromage frais
- from all angles
- from A to B
- from A to Z
- from bad to worse
- from cover to cover
- from day one
- from day to day (or hour to hour etc.)
- (from) door to door