| amu | atomic mass unit |
|---|---|
| AO | abdominal aorta; achievement orientation; acid output; acridine orange; ankle orthosis; anodal openi... |
| ARM | adrenergic receptor material; aerosol rebreathing method; ambulatory renal monitor; anorectal manome... |
| at | air tight; atom, atomic |
| at | no atomic number |