| OT | objective test; oblique talus; occlusion time; occupational therapist, occupational therapy; ocular ... |
|---|---|
| OTU | olfactory tubercle; operational taxonomic unit |
| DRG | Dorsal Root Ganglia |
| AR | absolute risk; accounts receivable; achievement ratio; actinic reticuloid [syndrome]; active resista... |
| ARA | Academy of Rehabilitative Audiometry; acetylene reduction activity; American Rheumatism Association;... |