| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Res... |
|---|---|
| PAS-C | para-aminosalicylic acid crystallized with ascorbic acid |
| OA | obstructive apnea; occipital artery; occipito-anterior; occiput anterior; octanoic acid; ocular albi... |
| AAF | acetylaminofluorene; ascorbic acid factor; African American Female |
| ASC | acetylsulfanilyl chloride; altered state of consciousness; ambulatory surgical center; American Soci... |