| OS | left eye [Lat. oculus sinister]; occipitosacral; occupational safety; office surgery; Omenn syndrome... |
|---|---|
| OSHA | Occupational Safety and Health Adminstration |
| OSH | Act Occupational Safety and Health Act of 1970 |
| PSAP | primary public safety answering point; prosaposin; pulmonary surfactant apoprotein |
| PTSM | Plant, Technology and Safety Management |