Noun beluga has 2 senses
  1. beluga, hausen, white sturgeon, Acipenser huso - valuable source of caviar and isinglass; found in Black and Caspian seas
    --1 is a kind of sturgeon
    --1 is a member of Acipenser, genus Acipenser
    --1 has parts: beluga caviar
  2. white whale, beluga, Delphinapterus leucas - small northern whale that is white when adult
    --2 is a kind of dolphin
    --2 is a member of Delphinapterus, genus Delphinapterus
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