Also called hausen. a white sturgeon, Huso huso, of the Black and Caspian seas, valued as a source of caviar and isinglass.
Also called sea canary, white whale. a cetacean, Delphinapterus leucas, of northern seas, that has a rounded head and is white when adult.

1585–95; < Russian belúga (now regularly belúkha for the cetacean), equivalent to bél() white + -uga, probably earlier *-ǫga (compare Czech pstruh, Polish pstrąg trout < *pĭstr- mottled + *-ǫgŭ a cognate suffix) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
beluga (bɪˈluːɡə)
1.  a large white sturgeon, Acipenser (or Huso) huso, of the Black and Caspian Seas: a source of caviar and isinglass
2.  another name for white whale
[C18: from Russian byeluga, from byely white]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1590s, from Rus. beluga, lit. "great white," from belo- "white" (from PIE *bhel-o-, from base *bhel- (1) "to shine, flash, burn;" see bleach) + augmentative suffix -uga. Originally the great sturgeon, found in the Caspian and Black seas; later (1817) also the small white
whale (Delphinapterus leucas) found in northern seas.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
She is still at it with the polar bears and now the beluga whale.
Participate in a live animal encounter to interact with a dolphin or beluga whale.
Although belugas are also known as white whales, beluga calves are born gray or brown.
The icy waters around the island are home to seals, walruses, beluga and bowhead whales and spiral-tusked narwhals.
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