| SDL | serum digoxin level; speech discrimination level |
|---|---|
| SSD | shaded surface display; single saturating dose; Social Security disability; source-skin distance; so... |
| TAD | test of auditory discrimination; thoracic asphyxiant dystrophy; transient acantholytic dermatosis |
| TD | tabes dorsalis; tardive dyskinesia; T-cell dependent; temporary disability; terminal device; tetanus... |
| VNDPT | visual numerical discrimination pre-test |