| CTU | cardiac-thoracic unit; centigrade thermal unit; constitutive transcription unit |
|---|---|
| BDR | background diabetic retinopathy |
| BI | background interval; bacterial or bactericidal index; base-in [prism]; basilar impression; Billroth ... |
| Bkg | background |
| GnRH | Gonadotropin Releasing Hormone [HP 1898, 2034] = LHRH = Go... |