[buh-loo-guh] 
| 1. | Also called hausen. a white sturgeon, Huso huso, of the Black and Caspian seas, valued as a source of caviar and isinglass. |
| 2. | Also called beluga, white whale. a cetacean, Delphinapterus leucas, of northern seas, that has a rounded head and is white when adult. |
| white whale n. A small toothed whale (Delphinapterus leucas), chiefly of northern waters, that is white when full-grown. Also called beluga, sea canary. |