| Abbreviation | Definition |
|---|---|
| ARC | Atypical Reparative Changes |
| ARCQ | Auditory Response Control Quotient |
| ARD | Acute Respiratory Disease |
| ARD | Aerosol Solid with Adapter |
| ARDS | Adult Respiratory Distress Syndrome |
| ARE | Active-Resistance Exercise |
| ARE | Antioxidant Response Element |
| AREDS | Age-Related Eye Disease Study |
| ARF | Acute Renal Failure |
| ARF | Acute Respiratory Failure |
| ARF | Acute Rheumatic Fever |
| ARI | Anxiety Reaction, Intense |
| ARIS | Adverse Reaction Information System |
| ARM | All Range Movement |
| ARM | Anxiety Reaction, Mild |
| ARM | Artificial Rupture of Membranes |
| ARMD | Age Related Macular Degeneration |
| ARNS | Acute Retinal Necrosis Syndrome |
| ARO | Aerosol Solid |
| AROM | Active Range Of Motion |