| ORA | opiate receptor agonist |
|---|---|
| IHSS(= HCMP) | Idiopathic Hypertrophic Subaortic Stenosis = Obstructive Idiopathic Hypertrophic Car... |
| PAA | partial agonist activity; phenylacetic acid; phosphonoacetic acid; physical abilities analysis; plas... |
| OA | obstructive apnea; occipital artery; occipito-anterior; occiput anterior; octanoic acid; ocular albi... |
| ODB | opiate-directed behavior |