| blaues Auge | black eye |
| Blausäure | hydrogen cyanide prussic acid hydrocyanic acid |
| bloßes Auge | naked eye |
| blaue Karte | blue card |
| Blattauge | leaf bud |
| Blaualge | cyanobacteria cyanophyta |
| Blaue Blume | blue flower |
| Blaupause | blueprint |
| Laubsäge | coping saw |
| Blutsauger | gadfly vampire sucker bloodsucker |
| Tagesauge | daisy |
| Glasauge | glass eye |
| Blasdüse | tuyere |
| Blaue Banane | Blue Banana |
| Blauer Riese | blue giant |
| Blauzunge | blue-tongue lizard |
| blauer Brief | pink slip |
| blaugrau | blue-gray |
| Blamage | disgrace |
| Blasebalg | bellows |