| SL | sarcolemma; sclerosing leukoencephalopathy; secondary leukemia; segment length; sensation level; sen... |
|---|---|
| SU | salicyluric acid; secretory unit; sensation unit; solar urticaria; sorbent unit; spectrophotometric ... |
| B.T.U. | British Thermal Unit |
| BThU | British thermal unit |
| BTU | British thermal unit |