| Rb | Imp rubber base impression |
|---|---|
| BI | background interval; bacterial or bactericidal index; base-in [prism]; basilar impression; Billroth ... |
| BD | barbital-dependent; barbiturate dependence; base deficit; base of prism down; basophilic degeneratio... |
| BRBN | blue rubber bleb nevus |
| BRBNS | blue rubber bleb nevus syndrome |