| BL | a common name for a variety of Sarcosomataceae |
|---|---|
| BL | a black flag bearing a white skull and crossbones |
| BL | small blackish stout-bodied biting fly having aquatic larvae |
| BL | a hilly forest region in southwestern Germany |
| BL | red fox in the color phase when its pelt is mostly black |
| BL | a Catholic friar wearing the black mantle of the Dominican order |
| BL | herb of southwestern United States having dark purple bell-shaped flowers mottled with green |
| BL | especially of western coastal regions of North America |
| BL | low hardy much-branched spiny shrub common in alkaline soils of western America |
| BL | grouse of which the male is bluish-black |
| BL | North Atlantic guillemot |
| BL | small mallee with rough dark-colored bark toward the butt yielding a red eucalyptus kino |