RF

• radial fiber;

• radiofrequency;

• rapid filling;

• readiness field;

• reading factor;

• receptive field;

• regurgitant fraction;

• Reitland-Franklin [unit];

• relative flow;

• relative fluorescence;

• release factor;

• renal failure;

• replacement fluid;

• replication factor;

• replicative form;

• repopulation factor [radiotherapy];

• resistance factor;

• resonant frequency;

• respiratory failure;

• respiratory frequency;

• reticular formation;

• retroperitoneal fibromatosis;

• rheumatic fever;

• rheumatoid factor;

• riboflavin;

• risk factor;

• root canal filling;

• rosette formation

• rate of flow