| NLA | National Leukemia Association; neuroleptoanesthesia; normal lactase activity |
|---|---|
| NOSTA | Naval Ophthalmic Support and Training Activity |
| NSILA | nonsuppressible insulinlike activity |
| OA | obstructive apnea; occipital artery; occipito-anterior; occiput anterior; octanoic acid; ocular albi... |
| ORSA | osteoclast resorption stimulating activity |