| ARNP | Advanced Registered Nurse Practitioner |
|---|---|
| ARO | Associate for Research in Ophthalmology |
| AROA | autosomal recessive ocular albinism |
| AROM | active range of motion; artificial rupture of membranes |
| arom | aromatic |
| ARP | absolute refractory period; American Registry of Pathologists; anticipated recovery path; apolipoprotein regulatory protein; assay reference plasma; assimilation regulatory protein; at risk period; automaticity recovery phase |
| ARPANET | Advanced Research Projects Agency Network |
| ARPD | autosomal recessive polycystic disease |
| ARPES | angular resolved photoelectron spectroscopy |
| ARPKD | autosomal recessive polycystic kidney disease |