| Abbreviation | Definition |
|---|---|
| AQ | Water |
| AQDIST | Distilled Water |
| AQUA | Water |
| AR | Acid Reflux |
| AR | Active Resistance |
| AR | Admitting Room |
| AR | Anti Reflux |
| AR | Apical Rate |
| AR | Artificial Respiration |
| AR | Assisted Respiration |
| AR | At Risk |
| ARA | Action Research Arm |
| ARA | Aerosol Liquid with Adapter |
| ARAT | Action Research Arm Test |
| ARB | Axon Retraction Ball |
| ARC | Access Respite Care |
| ARC | Aerobic Respiration Control |
| ARC | Age-Related Cataract |
| ARC | Aggregation of Red Cells |
| ARC | AIDS Related Complex |