beluga

noun pl. beluga or belugas

1. a large, white sturgeon (Huso huso) of the Black Sea and the Caspian Sea
2. a large, white toothed whale (Delphinapterus leucas) of northern seas: it is in the same family (Monodontidae) as the narwhal
3. caviar prepared from the eggs of the white sturgeon
   also called beluga caviar