| ARB | adrenergic receptor binder |
|---|---|
| ARIA | acetylcholine receptor-inducing activity; automated radioimmunoassay |
| ARM | adrenergic receptor material; aerosol rebreathing method; ambulatory renal monitor; anorectal manome... |
| ASGR | asialoglycoprotein receptor |
| BAR | bariatrics; barometer, barometric; beta-adrenergic receptor |