| AR | absolute risk; accounts receivable; achievement ratio; actinic reticuloid [syndrome]; active resista... |
|---|---|
| ARD | absolute reaction of degeneration; acute radiation disease; acute respiratory disease; adult respira... |
| ARP | absolute refractory period; American Registry of Pathologists; anticipated recovery path; apolipopro... |
| ART | absolute retention time; Accredited Record Technician; acoustic reflex test; algebraic reconstructio... |
| ATA | alimentary toxic aleukia; American Thyroid Association; aminotriazole; antithymic activity; antithyr... |