beluga

noun (plural same or belugas)

• 1a small, white-toothed whale related to the narwhal, living in herds mainly in Arctic coastal waters. Also called white whale.

  • Delphinapterus leucas, family Monodontidae

• 2a very large sturgeon occurring in the inland seas and associated rivers of central Eurasia.

  • Huso huso, family Acipenseridae
• (also beluga caviar) caviar obtained from the beluga sturgeon.