| OS | left eye [Lat. oculus sinister]; occipitosacral; occupational safety; office surgery; Omenn syndrome... |
|---|---|
| AAPCC | adjusted annual per capita cost; adjusted average per capita cost; American Association of Poison Co... |
| ADL | activities of daily living; Amsterdam Depression List; annual dose limit |
| ALI | acute lung injury; annual limit of intake; average lobe index |
| Ann | annual |