Medical(slang)
| Abbreviation | Meaning | Tamil Meaning | Category |
|---|---|---|---|
| O2 | Oxygen | - | Medical(slang) |
| OD | Right Eye | - | Medical(slang) |
| OD | Overdose | - | Medical(slang) |
| OGTT | Oral Glucose Tolerance Test | - | Medical(slang) |
| OPA | Oropharyngeal Airway | - | Medical(slang) |
| ORIF | Open Reduction Internal Fixation | - | Medical(slang) |
| OS | Left Eye | - | Medical(slang) |
| OU | Both Eyes | - | Medical(slang) |