| FID | flame ionization detector; free induction decay; fungal immunodiffusion |
|---|---|
| BSU | Bartholin, Skene, urethral [glands]; basic structural unit; British standard unit |
| LISREL | linear structural relation |
| SFIS | structural family interaction scale |
| SRU | sample ratio units; side rails up; solitary rectal ulcer; structural repeating unit |