| Abbreviation | Definition |
|---|---|
| AARL | Aeronautical Astronautical Research Laboratory |
| AARL | Anti Aging Research Laboratories |
| AARL | Arizona Advanced Reproductive Laboratory |
| AASL | Agricultural Analytical Services Laboratory |
| AAT | Alpha-1 Antitrypsin |
| AAT | Alpha1-AntiTrypsin |
| AB | Aerobic Bacteria |
| ABA | Applied Behavior Analysis |
| ABBL | Algae Biofuels and Biofluids Laboratory |
| ABBL | Animal Biosciences and Biotechnology Laboratory |
| ABC | Adaptive Behavior Center |
| ABC | Antibody Binding Capacity |
| ABCR | Atp Binding Cassette Retina |
| ABDR | Alaska Birth Defects Registry |
| ABDU | American Black Duck |
| ABEP | Auditory Brainstem-- Evoked Potential |
| ABER | Annual Blood Examination Rate |
| ABG | Aerobic Bacterial Generator |
| ABG | Arterial Blood Gas |
| ABG- | Arterial blood gases? |