| TF | free thyroxine; tactile fremitus; tail flick [reflex]; temperature factor; testicular feminization; ... |
|---|---|
| FIR | far infrared; fold increase in resistance |
| GEF | gastroesophageal fundoplication; glossoepiglottic fold; gonadotropin enhancing factor |
| JF | joint fluid; jugular foramen; junctional fold |