Etymology
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beluga (n.)

1590s, from Russian beluga, literally "great white," from belo- "white" (from PIE *bhel-o-, suffixed form of root *bhel- (1) "to shine, flash, burn," also "shining white") + augmentative suffix -uga. Originally the great white sturgeon, found in the Caspian and Black seas; later (1817) the popular name for the small white whale (Delphinapterus leucas) found in northern seas.

updated on October 13, 2017

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Definitions of beluga from WordNet

beluga (n.)
valuable source of caviar and isinglass; found in Black and Caspian seas;
Synonyms: hausen / white sturgeon / Acipenser huso
beluga (n.)
small northern whale that is white when adult;
Synonyms: white whale / Delphinapterus leucas
From wordnet.princeton.edu, not affiliated with etymonline.