| SFD | silo filler's disease; skin-film distance; small for dates; spectral frequency distribution |
|---|---|
| SFS | serial foveal seizures; skin and fascia stapler; social functioning schedule; spatial frequency spec... |
| shf | super-high frequency |
| SSCF | sleep stage change frequency |
| TF | free thyroxine; tactile fremitus; tail flick [reflex]; temperature factor; testicular feminization; ... |