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Definition of: beluga
(bə·l
′gə) noun plural ·ga or ·gas
1. A dolphin (Delphinapterus leucas) of arctic and sub-arctic seas; adults are of a white color and from 10 to 12 feet long: also called white whale.
2. The great white sturgeon (Acipenser huso), found in the Caspian Sea and the Black Sea; its roe is Beluga caviar. [<Russian byelukha <byelo white]
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