Delphinapterus leucas
beluga
noun
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A cetacean, Delphinapterus leucas, found in the Arctic Ocean.
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A fish found in the Caspian Sea and the Black Sea (Huso huso), that is a source of caviar.
How often have the words Delphinapterus leucas and beluga occurred in a corpus of books? (source: Google Ngram Viewer )