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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Borrowed from Russian белу́га (belúga), from бе́лый (bélyj, “white”). In modern standard Russian, белу́га (belúga) denotes the fish Huso huso only, while белу́ха (belúxa) denotes the cetacean.
hausen, white sturgeon, Acipenser huso
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Classic usage
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