| Blaualge | cyanobacteria cyanophyta |
| Blamage | disgrace |
| Braunalge | brown alga |
| Blauzunge | blue-tongue lizard |
| Bläue | blueness |
| Blage | brat |
| Blattauge | leaf bud |
| Blaupause | blueprint |
| Blauracke | European roller |
| Blauregen | wisteria |
| Blausäure | hydrogen cyanide prussic acid hydrocyanic acid |
| Blauwal | Blue Whale blue whale |
| blauäugig | blue eyed blue-eyed starry-eyed |
| Ölauge | goatfucker |
| Gläubige | believer |
| Lauge | lye |
| Blasdüse | tuyere |
| Blasrolle | party horn |
| Blaubart | Bluebeard |
| Blaublüter | blue blood |