| HN | head and neck; head nurse; hemagglutinin neuraminidase; hematemesis neonatorum; hemorrhage of newbor... |
|---|---|
| VATER Associations | Vertebral defects Anal atresia Tracheo-Esophageal fistula ... |
| AR | absolute risk; accounts receivable; achievement ratio; actinic reticuloid [syndrome]; active resista... |
| A/R | apical/radial |
| DRID | double radial immunodiffusion; double radioisotope derivative |