| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |
|---|---|
| UD | ulcerative dermatosis; ulnar deviation; undetermined; underdeveloped; unit dose; urethral dilatation... |
| VD | vapor density; vascular disease; vasodilation, vasodilator; venereal disease; venous dilatation; ven... |
| NSD | Nasal septal deviation |